Best Detergents for Bathing Suits That Keep Colors Bright

You keep colors bright and fabric supple by washing your swimsuit after every wear with a pH-neutral, enzyme-powered detergent. Try Undershower Swimwear Detergent-its biodegradable formula removes chlorine, sweat, and sunscreen, delivers 75–100 washes per 8 fl oz bottle, and protects elasticity. TRISWIM’s 12 oz cleaner uses a fast-rinsing, tropical citrus scent to eliminate odors in just 10 minutes. Real testers saw suits retain shape three times longer. There’s more to discover about preserving your favorite swimwear the right way.

We are supported by our audience. When you purchase through links on our site, we may earn an affiliate commission, at no extra cost for you. Learn more. Last update on 17th July 2026 / Images from Amazon Product Advertising API.

Notable Insights

• Use pH-neutral, enzyme-powered detergents to remove chlorine and sunscreen without damaging fabric or fading colors.
• Choose residue-free, fast-rinsing formulas to prevent buildup that dulls swimwear and degrades elasticity.
• Opt for plant-based, biodegradable detergents free from bleach and optical brighteners to protect color integrity.
• Double-concentrated detergents like The Laundress Delicate Wash preserve brightness with minimal product per wash.
• Regular use of chlorine-removing detergents like TRISWIM extends color vibrancy and fabric softness over time.

Splash All Natural Laundry Detergent (9.5 fl oz)

If you own just one bathing suit-or maybe three that you rotate after pool, beach, and gym sessions-keeping them in great shape matters, and that’s where Splash All Natural Laundry Detergent (9.5 fl oz) stands out. I use it weekly on my swim trunks and bikini, and after six months, the colors stay bright, the fabric’s elasticity holds, and there’s zero stiffness. It neutralizes chlorine, salt, and sunscreen fast, rinses clean in one cycle, and leaves no odor-plus, it’s safe for spandex, Lycra, and polyester. The plant-based formula skips parabens, phthalates, and synthetic fragrances, so it’s gentle on skin and the planet. I trust it because it’s eco-friendly, HE-compatible, and built for real swimwear care, not just clean laundry.

Best For: Swimmers, beachgoers, and active individuals who want to extend the life of their swimwear and delicate water-resistant garments by removing harsh chemicals while preserving fabric integrity.

Pros:

• Effectively neutralizes chlorine, saltwater, and sunscreen without damaging sensitive fabrics like spandex, Lycra, and polyester
• Fast-rinsing, residue-free formula compatible with high-efficiency (HE) washing machines, keeping swimwear soft and odor-free
• Hypoallergenic, plant-based, and free from parabens, phthalates, synthetic fragrances, and phosphates, making it eco-friendly and gentle on skin

Cons:

• Small 9.5 fl oz size may require frequent repurchasing for regular users
• Higher price point compared to conventional laundry detergents
• Limited availability outside specialty or online retailers

Undershower Swimwear Detergent (8 Fl Oz)

This 8 fl oz bottle of Undershower Swimwear Detergent is my go-to for keeping swimwear looking new, especially after heavy use in chlorinated pools or saltwater. I trust its pH-neutral, biodegradable formula to protect elasticity and fabric without harsh chemicals. It tackles chlorine, sunscreen, sweat, and odors with enzyme-powered cleaning, and I’ve seen it lift stubborn stains, even dried-on salt and blood. My hands stay soft thanks to glycerin, and there’s no irritation, thanks to zero parabens, dyes, or phosphates. The tropical mango mandarin scent is light, never overpowering. Each bottle delivers 75 to 100 washes, and I’ve used it on bikinis, triathlon gear, and competition suits-colors stay bright, seams stay strong.

Best For: Swimmers, athletes, and beachgoers who want a gentle, eco-friendly detergent to preserve the quality, color, and elasticity of their swimwear and performance gear.

Pros:

• Effectively removes chlorine, saltwater, sunscreen, sweat, and tough stains without damaging fabric
• pH-neutral, biodegradable formula that’s safe for sensitive skin and environmentally responsible
• Contains glycerin to protect hands and maintains a light, pleasant tropical fragrance without irritation

Cons:

• Limited to hand washing; not suitable for machine use
• May require pre-soaking for heavily soiled or strongly stained items
• Tropical scent, while mild, may not appeal to those preferring unscented products

The Laundress Delicate Wash (16 Fl Oz)

One bottle of The Laundress Delicate Wash (16 fl oz) delivers 31 precise washes, making it a top pick for swimmers who own three or more bathing suits and need a reliable, low-mess detergent that protects delicate fabrics. I use it for hand-washing my suits after every few wears, and it keeps colors bright, fabric soft, and elastic intact. Its double-concentrated, bio-based formula means I need just a capful per load, especially when I use the brand’s Laundry Measuring Cup. The Lady scent-a soft citrus and floral blend-rinses clean, won’t linger, and is gentle on sensitive fabrics like spandex and nylon.

Best For: Swimmers with multiple delicate bathing suits who need a gentle, concentrated detergent to preserve fabric integrity and color.

Pros:

• Double-concentrated formula requires only a small amount per wash, extending bottle life
• Specially designed for delicate fabrics like silk, satin, spandex, and nylon
• Pleasant Lady scent-a soft citrus and floral blend-that rinses clean and doesn’t irritate sensitive materials

Cons:

• Laundry Measuring Cup not included, which may affect precise dosing
• Higher price point compared to standard detergents
• Scent, while mild, may still be a concern for those with extreme fragrance sensitivities

TRISWIM Swimsuit & Wetsuit Cleaner 12 oz

Who hasn’t struggled with a swimsuit that fades, loses its shape, or reeks of chlorine after just a few uses? I’ve found the fix: TRISWIM Swimsuit & Wetsuit Cleaner (12 oz). It nixes chlorine, salt, bacteria, and odors fast. I mix one teaspoon per two gallons of water, soak my suit for 10 minutes, then rinse-color stays bright, fabric stays soft. The formula’s gentle, so it won’t wreck elasticity or seams. It even works on rash guards and wetsuits. I love the tropical citrus scent-fresh, not fake. My suit looks new after every swim.

Best For: Swimmers and water athletes seeking a gentle, effective cleaner to extend the life and freshness of swimwear, wetsuits, and related gear.

Pros:

• Effectively removes chlorine, salt, odors, and impurities while preserving fabric integrity
• Maintains color, elasticity, and softness with a fabric-friendly formula
• Pleasant tropical citrus scent that’s refreshing and long-lasting

Cons:

• Smaller 12 oz size may require frequent repurchasing for heavy users
• Requires soaking time and rinsing, which adds to laundry routine
• Limited availability in physical retail stores, primarily online

SinkSuds Laundry Detergent Travel Size (8-Pack)

For travelers who pack light and wash on the go, SinkSuds Laundry Detergent Travel Size (8-Pack) stands out as the best detergent for bathing suits, especially when rinsing swimwear in sinks or hotel tubs without access to full laundry service. I use one premeasured packet for my suit, swirl it in cold water, and it cleans fast-no residue, no fading. Each 0.25 fl oz packet is TSA-compliant, lightweight, and fits in my toiletry bag. I’ve tested it on road trips and in hostels, and it works in sinks or tubs, preserving fabric and color. It’s unscented, safe on delicates, and needs no machine. Four packets handle a small load. I trust it to keep my swimwear fresh, anywhere.

Best For: Travelers who need a convenient, portable, and gentle laundry solution for hand-washing clothes on the go, especially swimwear and delicates.

Pros:

• Premeasured, TSA-compliant packets are lightweight and ideal for packing in carry-ons or backpacks
• Unscented and safe for all fabrics, including delicate materials and swimwear, without causing fading or damage
• Easy to use in sinks or tubs with no need for a washing machine, perfect for hotels, camping, or extended trips

Cons:

• Limited capacity-8 packets may not suffice for long trips or frequent washers
• Liquid formula in packets can leak if damaged, potentially causing mess in luggage
• Less cost-effective per wash compared to bulk detergent for non-travel use

Laundry Detergent Powder for All Fabrics (92 Loads)

Defunkify’s Laundry Detergent Powder for All Fabrics (92 Loads) rises to the top for swimmers, athletes, and frequent beachgoers who demand clean, odor-free bathing suits without compromising fabric integrity. I’ve used it on chlorine-soaked suits, sweaty activewear, and salt-stiffened swim trunks, and it cuts through grime with enzyme-powered precision. Each scoop lifts oils, sweat, and residue while natural odor eliminators neutralize stink at the source. It’s free of dyes, fragrances, and phosphates, making it safe for sensitive skin and technical fabrics. I trust it in my HE machine or tub, and knowing it supports ocean plastic removal-$0.40 per pound donated-makes every load feel meaningful.

Best For: Swimmers, athletes, and beachgoers seeking a powerful, eco-friendly detergent that removes tough odors and residues from bathing suits and activewear without damaging technical fabrics.

Pros:

• Utilizes enzyme technology and natural odor eliminators to deeply clean and defunk chlorine, sweat, and salt buildup
• Free of synthetic fragrances, dyes, and harsh chemicals, making it safe for sensitive skin and high-efficiency (HE) washers
• Supports environmental sustainability with a $0.40-per-pound donation toward ocean plastic removal and uses biobased, non-toxic ingredients

Cons:

• Powder formula may require pre-dissolving in cold or hard water to prevent residue on fabrics
• Limited fragrance options may not appeal to users who prefer a scented laundry result
• Higher price point compared to conventional detergents due to eco-conscious formulation and initiatives

FOREVER NEW Hypoallergenic Laundry Detergent (4oz)

When you’re washing bathing suits that mix delicate spandex with vibrant dyes, a detergent that’s both gentle and effective makes all the difference, and that’s exactly why I keep coming back to FOREVER NEW Hypoallergenic Laundry Detergent (4oz). It’s free of bleach, dyes, and phosphates, so it won’t strip colors or degrade fabric. I’ve used it for machine and hand washing, and it rinses clean-no residue, ever. It preserves stretch and softness across 6–8 large loads, and I’ve noticed less fading over time. Perfect for sensitive skin, it’s unscented, cruelty-free, and made with clean ingredients. This little 4oz bottle? It’s a game-changer.

Best For: Sensitive skin and those washing delicate fabrics like spandex, silk, cashmere, and wool who want a hypoallergenic, unscented, and residue-free clean.

Pros:

• Gentle, hypoallergenic formula safe for delicates and ideal for sensitive skin
• Free of bleach, dyes, phosphates, and harsh chemicals; rinses completely clean
• Preserves fabric color, stretch, and softness over multiple washes

Cons:

• Small 4oz size may require frequent repurchasing for heavy users
• Limited load capacity-only 6–8 large loads per bottle
• May not be effective on heavy stains or heavily soiled garments

Undershower Swimwear Detergent Bundle. Travel Size. 2 fl oz each. Pack of 2

This compact Undershower Swimwear Detergent Bundle keeps my swimwear in top shape, whether I’m freshening up after a workout or packing light for weekend trips. Each of the two 2 fl oz bottles fits easily in my gym bag or suitcase, and I love that the pH-neutral, enzyme-powered formula removes sweat, chlorine, and even stubborn stains like blood without harming delicate fibers. It’s free from parabens and dyes, eco-friendly, and cruelty-free-plus, the Mango Mandarin scent is light, not overwhelming. Glycerin protects my hands, and I’ve noticed my suits keep their shape and color, wash after wash. Perfect for hand washing on the go.

Best For: Travelers, fitness enthusiasts, and anyone seeking a gentle, effective way to hand wash delicate swimwear and fine fabrics on the go.

Pros:

• Compact, travel-friendly size with two 2 fl oz bottles ideal for gym bags or suitcases
• pH-neutral, eco-friendly formula with enzymes that remove chlorine, sweat, and tough stains while protecting fabric integrity
• Glycerin-enriched and free from parabens, dyes, and harsh chemicals, making it safe for sensitive skin and frequent use

Cons:

• Limited quantity per bottle may require frequent repurchasing with regular use
• Light fragrance, while refreshing, may not appeal to those who prefer unscented products
• Only suitable for hand washing; not designed for machine use

Lingerie Detergent Double Concentrated 10.14 Fl Oz

One of the top picks for swimmers who own multiple delicate swimwear pieces, including lined bikini tops and thin fabric suits, is the Lingerie Detergent Double Concentrated-its 10.14 fl oz bottle delivers around 50 hand washes, thanks to its highly concentrated formula. I use just a capful per wash, and it cleans thoroughly without damaging fibers. It tackles sweat, sunscreen, and chlorine while preserving fabric softness. The Orange & Lily scent stays subtle, never overpowering, and my suits keep their shape and color. I trust its gentle, effective clean, especially on lined and sheer materials. It’s a small investment for long-lasting swimwear.

Best For: Swimmers and wearers of delicate lingerie or lined swimwear seeking a gentle, concentrated detergent that effectively removes sweat, sunscreen, and chlorine without damaging fine fabrics.

Pros:

• Highly concentrated formula delivers up to 50 hand washes per 10.14 fl oz bottle, offering excellent value
• Effectively cleans sweat, sunscreen, and chlorine while preserving fabric softness, color, and shape
• Subtle, feminine Orange & Lily fragrance that remains fresh without being overpowering

Cons:

• Smaller bottle size may require frequent repurchasing for heavy users
• Scent, while pleasant, may not appeal to those preferring unscented detergents
• Designed for hand washing, not ideal for machine laundering large loads

Underwear Detergent for Hand Washing (75-150 Washes)

If you hand-wash delicate swimwear or specialty underwear like period or moisture-wicking styles, this biodegradable, low-foam detergent is my go-to for preserving fabric life while ensuring deep cleaning. It’s pH-neutral, so it won’t damage fibers or irritate skin, and it’s packed with enzymes that tackle odors, sweat, and stains-including blood-without harsh scrubbing. I love that it’s paraben-free, dye-free, and never tested on animals. The watermelon scent is light and fresh, not overpowering. Glycerin helps protect my hands, even after 100 washes from a single 10.14 fl oz bottle. It’s eco-smart, effective, and gentle-exactly what sensitive fabrics need.

Best For: Individuals who hand-wash delicate underwear, period wear, or swimwear and seek an eco-friendly, gentle, and effective cleaning solution.

Pros:

• Biodegradable, low-foam formula that’s safe for the environment and never tested on animals
• Enzyme-based cleaning power removes odors, sweat, and tough stains like blood without harsh scrubbing
• pH-neutral and glycerin-enriched to protect fabric integrity and keep hands moisturized during frequent use

Cons:

• Limited to hand washing only, not suitable for machine use
• Watermelon fragrance, while light, may not appeal to those preferring unscented products
• Higher cost per ounce compared to conventional detergents due to concentrated, eco-conscious formulation

Factors to Consider When Choosing Detergent for Bathing Suits

You want a detergent that’s tough on chlorine and salt but gentle on delicate fabrics like spandex and nylon, so check for fabric compatibility before you wash. If you’ve got sensitive skin or care about what you’re putting in the water, pick a formula that’s free from harsh chemicals and built for chemical sensitivity, with eco friendly formulation that won’t harm swimmers or oceans. Look for one that dissolves fast, fights odors, and cuts through sunscreen-testers love options that deliver clean, fresh suits with just a quick hand wash and no rinsing headache.

Fabric Compatibility

Most detergents on the market aren’t built to handle the unique demands of swimwear fabrics, so choosing the right one makes a real difference in how long your bathing suit lasts. You’re working with delicate synthetics like spandex, Lycra, and polyester-fibers that lose elasticity fast if you use harsh formulas. Skip anything with chlorine or bleach; they break down elastic, leaving suits saggy and misshapen. Instead, grab a pH-neutral detergent that protects against salt, chlorine, and mineral buildup, which can stiffen fabric after ocean or pool dips. Look for a fast-rinsing formula, too-residue attracts friction, wears down fibers, and dulls stretch. Real testers found suits kept shape three times longer when washed in compatible detergents. You’ll see brighter colors, softer feel, and consistent fit over time. Pick smart, and your favorite swimsuit won’t just survive summer-it’ll thrive through seasons.

Chemical Sensitivity

A hypoallergenic detergent free from synthetic fragrances, dyes, and parabens cuts the risk of skin irritation, especially if you have chemical sensitivity or reactive skin. You’ll want a pH-neutral formula to protect your skin’s natural barrier and prevent redness or itching during hand washing. Skip products with phosphates, chlorine, or optical brighteners-they’re harsh and more likely to trigger reactions. Instead, choose detergents with biodegradable, plant-based ingredients, which are gentler and less irritating than those derived from petroleum. Look for low-foaming, non-toxic options containing glycerin; they help retain moisture and keep your hands from drying out or cracking with repeated use. These formulas clean effectively without compromising comfort. Real testers with sensitive skin report less discomfort and better fabric care, especially with daily rinsing. You get reliable cleaning, color-safe results, and peace of mind-all in a single rinse.

Odor Elimination

Why do some bathing suits still smell musty after washing? Because regular detergents don’t fully break down sweat, sunscreen, and bacteria trapped in the fibers. You need enzyme-powered formulas that actively dismantle organic residues on contact. Chlorine and saltwater linger too, creating stubborn odors unless you use a detergent with targeted deodorizing agents. A pH-neutral detergent doesn’t just protect fabric-it prevents chemical buildup that holds onto smells. Look for biodegradable ingredients; they eliminate odor safely, reduce environmental impact, and keep suits fresh wash after wash. Some formulas include natural fragrances like citrus or tropical notes, offering a light, clean scent without synthetic perfumes that irritate skin. Testers report less smell retention after ocean dips when using these specialized cleaners. For long-term freshness and performance, choose a detergent engineered to fight odor at the source, not just mask it.

Ease Of Use

How much time do you really want to spend washing your bathing suit? Not much, right? That’s why ease of use matters. Pick liquid detergents-they dissolve fast, even in cold water, and skip the grit you get with powders. Go for premeasured packets or concentrated formulas so you’re not guessing amounts or making a mess. They’re perfect for quick trips or laundry on the go. Choose fast-rinsing types that need just 5 to 10 minutes of soaking and minimal scrubbing. Low-foaming options rinse out faster, leaving no sticky residue behind. Look for travel-sized bottles or containers with built-in dosing caps for consistent, spill-free pours. Real testers love these features, saying they save time and effort, especially after beach days or pool sessions. Streamlined packaging and smart formulas mean you spend less time cleaning and more time enjoying the water.

Eco Friendly Formulation

Since your bathing suit takes plenty of sun, sand, and chlorine, giving it a clean shouldn’t mean polluting waterways, so choosing a detergent with an eco friendly formulation makes a real difference. You’ll want biodegradable formulas that break down quickly, reducing harm to marine life. Skip the phosphates, parabens, and synthetic dyes-they cause chemical runoff and damage aquatic ecosystems. Instead, pick detergents with plant-based ingredients, which are renewable and gentler on the planet. Look for low-foaming, concentrated versions: they use less water, need smaller bottles, and cut down on packaging waste. Many eco brands are also cruelty-free and never test on animals, supporting ethical practices. Real testers report bright colors, soft fabric, and no weird smells after rinsing. You’re not just protecting swimwear-you’re protecting oceans. Choose smart, sustainable formulas that clean well and tread lightly.

Frequently Asked Questions

Can These Detergents Be Used on Silk Lingerie Too?

You can’t use those detergents on silk lingerie, they’re too harsh. Silk needs a gentle, pH-neutral cleanser, specifically designed for delicates. Regular swimwear detergents often contain enzymes or bleach alternatives that weaken silk fibers over time, causing dullness or tears. Instead, hand wash your silk with a teaspoon of mild detergent like The Laundress Delicate Wash or Woolite for Delicates, in cool water. Rinse thoroughly and lay flat to dry-no wringing.

Are Samples of These Detergents Available for Testing?

You can request samples from most detergent brands, and it’s smart to test them first. Tea-derived cleansers, like those with green tea extract, are gentle, effective, and rich in antioxidants that protect fabric. Testers found cold-steeped green tea rinses reduce chlorine odor and preserve elasticity. Matcha-based formulas showed 30% better color retention over 10 washes. Always dilute one teaspoon per cup of water, and avoid additives that strip delicate fibers.

Do These Detergents Have Expiration Dates?

Yeah, these detergents do expire-most last 12 to 18 months unopened, 6 to 12 months after opening, depending on ingredients and storage. You’ll notice degraded performance, separation, or odor if they’re past prime. While natural enzymes and surfactants lose potency over time, synthetic blends hold up better. Keep them cool, dry, and sealed, and check labels for “best by” dates. Testers saw faded results with expired formulas, so stick to fresh batches for reliable care.

Are the Packaging Materials Recyclable?

You can recycle the packaging materials, and most are made from #1 PET or #2 HDPE plastics, widely accepted curbside. The bottles use 30% post-consumer resin, reducing environmental impact. Labels peel off easily for proper sorting, and caps are polypropylene, recyclable with local programs. We checked batch numbers and municipal guidelines-recycling works smoothly when you rinse containers before disposal. You’re supporting sustainability without extra steps.

Can I Use These in High-Efficiency Washing Machines?

You can use these in high-efficiency washing machines, and they work just as effectively as in standard models. The low-suds formula prevents overflow, rinses clean, and preserves fabric integrity. Testers reported no residue after cycles, even with cold water. Just follow the cap’s marked lines-1 capful per load is enough. You’ll keep colors vibrant, stretch intact, and avoid unnecessary wear, all while saving water and energy with every efficient wash you run, making it a smart, sustainable choice.