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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Your swimsuit takes a beating every time you hit the pool. Chlorine, sunscreen, sweat, and salt water all attack the fabric and fade the colors, and a regular detergent often makes things worse by stripping the stretch. The right wash preserves the fabric’s stretch and color, extending your suit’s life.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
The goal is to find the best detergent for swimsuits that removes chlorine and sunscreen while keeping the fabric stretchy and colors bright.
Our Picks at a Glance
How To Choose The Best Detergent for Swimsuits
Your swimsuit detergent should match how you actually swim. If you’re a pool swimmer, you need chlorine and sunscreen removed; if you’re a beach-goer, you’re mostly fighting salt and sand. The right product matches your washing habits, not just its marketing claims.
Chlorine and sunscreen removal
Chlorine is the biggest enemy of swimsuit fabric, breaking down elastic and fading colors over time. A good swimsuit detergent is formulated to lift chlorine and sunscreen residue out of the fibers, so your suit keeps its stretch and its color instead of turning dull and baggy.
Rinse or no-rinse formulas
Some swimsuit detergents let you skip rinsing entirely, so you can soak your suit in a hotel sink and hang it up right away. Others need a thorough rinse. No-rinse formulas save time and water, but if you’d rather rinse with fresh water for confidence, pick a product that works both ways.
Ingredients and skin sensitivity
Swimsuits sit directly against your skin, often for hours at a time. If you have sensitive skin, a scent-free, dye-free, and phosphate-free formula is a safer bet. Many dedicated swimwear cleaners skip synthetic dyes and fragrances entirely, which means less irritation and no leftover perfume fighting with the smell of the pool.
Quick Comparison
| Model | Best For | Volume | Weight | Rinsing | Amazon |
|---|---|---|---|---|---|
| Soak Laundry Soap (2-Pack)★ Best Overall | Delicates and multi-fabric wash | 12 fl oz per pack | 1.91 lb | No-rinse | Amazon |
| Molly’s Suds Swimwear Cleaner | Chlorine and sunscreen removal | 16 fl oz | 1.1 lb | Soak, then drain | Amazon |
| Soak Minisoak Travel Pack | Sink washing while traveling | 5 ml per pack | 4.54 g | No-rinse | Amazon |
| Forever New Stretch Active Wear | Workout gear and swimwear | 42 fl oz | 2.9 lb | Machine or hand | Amazon |
In‑Depth Reviews
1. Soak Laundry Soap – 2 Pack Shop & Share
Our pick — over 4.5★ from 450+ verified ratings; the strongest balance of quality and price.
The no-rinse powerhouse that handles swimwear, sweaters, and your favorite lacy things in one bottle.
What wins people over here is the cleaning performance, with the lovely fragrance right behind it. Buyers report using it to hand wash sweaters and finding it worked so well they started using it in the washing machine too. That flexibility lets one product handle both a quick sink soak and a full machine load of delicates.
The formula skips rinsing entirely, which makes it easily easy for a hotel sink or a quick bathroom soak. Its plant-derived, biodegradable, phosphate-free, dye-free, and sulphate-free formula is gentle on skin and the environment. Since it is safe for hand or machine washing, including HE machines, you are not locked into one routine.
This 2-pack gives you two 12 fl oz bottles at 1.91 pounds total, making it the heavier, more substantial option on this list compared to Molly’s Suds at 1.1 pounds. Owners note the scent is noticeable but not overpowering, with one preferring the “Celebration” fragrance for its softness. A few find it pricey for the size, but the concentrated formula stretches further.
What owners love
- No-rinse design makes hand washing a 5-minute job
- Works for swimwear, wool, lingerie, and baby clothes
- Pleasant scents without being overpowering
The trade-offs
- Per-bottle price sits higher than basic detergents
- Some buyers prefer rinsing anyway for confidence
Reach for this if: you want one gentle wash that protects swimwear, sweaters, and lingerie with zero rinsing and a lovely scent.
Look elsewhere if: you need a chlorine-specific treatment and prefer a product named for swimwear.
2. Molly’s Suds Swimwear Cleaner
The swim-specific soak that pulls chlorine and sunscreen out of the fibers before you hang your suit up.
This is the one product on the list built specifically for the pool-and-beach problem. It is designed to reach deep into the fibers of swim trunks and bathing suits to cleanse and revive them, removing sand, salt, chlorine, oils, and sunscreen residue. Owners mention watching the chlorine rise to the top of the water minutes after pouring it into the wash bowl, a visual that makes it clear the product is working.
The 16 fl oz bottle weighs just 1.1 pounds, noticeably lighter than the Soak 2-pack at 1.91 pounds, and it is color-safe across all delicate fabric types. It comes from a formula developed by a pediatric nurse and mom, is certified cruelty-free, and is made in the USA without synthetic dyes or fragrances. Owners with sensitive skin appreciate the absence of harsh ingredients.
Mixed feedback appears around the scent and color protection, with some owners reporting a faint lingering chlorine smell after washing while others say it completely removes the chlorine odor. A 20-minute soak is all it takes to handle salt, sunscreen, and sweat. The catch is that a few owners did not see the chlorine smell vanish after multiple washes, so results can vary with how heavily you use the pool.
The stand-out feature: a dedicated swimwear rinse that lifts chlorine and sunscreen while protecting color and fabric, ideal for anyone who practically lives in the water.
Honest note: results vary for heavy pool users, and the bottle offers no usage instructions, so expect a bit of trial and error.
3. Soak ST05-6 Minisoak Travel Pack-Scentless
The pocket-sized, scent-free soak that keeps your swimsuit fresh even when you are miles from home.
Buyers praise this detergent most for its cleansing power, and they love how travel-friendly it is. One owner said: “This worked very well for washing underwear in a sink during a trip to Europe.” That’s exactly what this travel pack is for — a quick nightly sink wash so your swimsuit and undergarments are ready for the next day, without paying hotel laundry prices.
Each pack holds just 5 ml of concentrated liquid and weighs a featherlight 4.54 g, so it disappears into a dopp kit or carry-on. The scentless formula suits fragrance-sensitive skin, and it is made in Canada. It is also dye-free, phosphate-free, and biodegradable, which means you can even use it while tent camping without worrying about attracting wildlife with perfume.
Owners note it rinses out easily despite the no-rinse claim, and a quick 20-minute soak keeps clothes fresh even after sweaty days. This is the baby of the lineup — compare that 5 ml packet to the huge 42 fl oz Forever New bottle and you see the size difference is dramatic. The main trade-offs are the per-use price and the packaging waste from single-use packets.
Why it wins
- Ultra-portable 5 ml packets for sink washing anywhere
- Scent-free formula suits sensitive skin and camping
- No-rinse soak is done in about 20 minutes
Who should pass
- Home users need a bigger, more economical bottle
- Single-use packets create more packaging waste
Perfect for: frequent travelers who need a gentle, scent-free soak in a hotel sink or on a camping trip.
Not ideal for: anyone who washes swimsuits at home daily, where a larger bottle makes more sense.
4. Forever New Stretch Active Wear Laundry Detergent
The big-bottle workhorse that strips sweat odor while keeping your suit’s stretch and colors intact.
This is the volume king of the list at 42 fl oz, a massive 2.6x more liquid than Molly’s Suds 16 fl oz bottle, and it does the whole job in one go. It is formulated for workout clothes, swimwear, yoga wear, and athletic gear, removing sweat, body oils, odor, soil, and chlorine while preserving stretch and elasticity. Customers note washing softball uniforms and seeing no sweat smell after a single wash, with stains coming out of white pants too.
The Pure Sport Scent delivers on freshness, and owners note it keeps garments looking new and maintains bright colors. A user washing grip socks inside out found it prevented fading and kept colors vibrant, while another said it brought knit pants back to life. The formula is gentle enough for elastic, though hand-washing is recommended to protect it over time.
At 2.9 pounds, this is the heaviest bottle here, but you get a lot of washes for the weight. The one honest note is that this is a premium-priced bottle, and the brand emphasizes its performance for activewear rather than strictly swimwear. Owners also noticed clothing felt noticeably softer after the first wash compared to regular detergents, which is a nice bonus for items that sit against your skin all day.
The edge: one 42 fl oz bottle replaces both your swimsuit wash and your workout-gear wash, saving you from buying two products.
The reality: it costs more upfront, but the sheer volume makes per-wash value strong for frequent swimmers and gym-goers.
Understanding the Specs
Chlorine removal
Chlorine is what fades swimsuit colors and breaks down the elastic that holds everything in place. A dedicated swimwear cleaner is formulated to pull chlorine and sunscreen out of the fabric fibers so your suit keeps its stretch and its bright colors after many trips to the pool.
No-rinse formulas
No-rinse detergents are designed to stay in the fabric after washing, so you save time and water. That’s handy for hotel sinks and quick soaks, though some owners still prefer a fresh-water rinse for confidence. Rinse-out formulas are more traditional and work well for full machine loads.
FAQ
Can I use regular laundry detergent on my swimsuit?
How often should I wash my swimsuit with detergent?
Will a no-rinse detergent leave residue on my skin?
What is the difference between swimwear cleaner and regular detergent?
Does hand washing or machine washing work better for swimsuits?
Will these detergents remove sunscreen stains?
How long should I soak my swimsuit in the detergent?
Final Thoughts: The Verdict
For most buyers, the best detergent for swimsuits is the Soak Laundry Soap 2-Pack because it combines a no-rinse design, a lovely scent, and versatility for swimwear, sweaters, and lingerie all in one bottle. If you want a product named specifically for chlorine and sunscreen removal, grab the Molly’s Suds Swimwear Cleaner. And for frequent travelers who need to hand wash a swimsuit in a hotel sink, the Soak Minisoak Travel Pack is the one to reach for. If you also wash workout gear and want a big-bottle value, the Forever New Stretch Active Wear covers swimwear and athletic clothes at 42 fl oz.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.