Period Underwear: How to Wash It So It Lasts (No Damage, No Odor)

Key Takeaways:

• Proper Care for Leakproof Underwear: Proper care and washing techniques can significantly extend the lifespan and effectiveness of leakproof period underwear.

• Why Cold Water Washing Matters: Cold water rinsing and using mild, fragrance-free detergents prevent damage to the fabric's absorbency and prevent odor.

• Preserve Leakproof Layers: Avoiding bleach, fabric softeners, hot water washings, and handing to dry preserves the technical fabric layers essential for the underwear's leakproof capabilities.

If you’ve joined the revolution of leakproof period underwear, you know how life-changing it can be. No more panic over leaks at work, no more scrambling for pads or dashing awkwardly to the bathroom. Period underwear can be a game-changer. But here’s the thing: even the best, most durable pairs need a bit of TLC to keep performing at their best.

That’s where Saalt comes in. At Saalt, we believe every pair of underwear should empower you, not stress you out—so we’re making sure yours last longer, stay odor-free, and feel as fresh as the first wear. Our leakproof underwear isn’t just designed to handle period flow, discharge, and the occasional sneeze (hello, bladder leaks); it’s made to last, thanks to premium materials and thoughtful craft. But a big part of their longevity depends on how you care for them.

So if you’ve ever wondered—period underwear: how to wash it so it lasts?—you’re in the right place. Let’s get into the tips, myths, and easy routines to keep your Saalt underwear (and every day) worry-free, fresh, and eco-friendly.

Understanding Saalt’s Leakproof Layers

Leakproof underwear isn’t just regular underwear with a little extra padding—it’s built with love, science, and comfort in mind. At their core, these patented undies are crafted with multiple specialized layers, each playing a crucial role to protect you from period flow, bladder leaks, and other surprises.

First up: the moisture-wicking layer. This ultra-soft layer sits closest to your skin and quickly draws wetness away, keeping you feeling dry whether you’re dealing with a heavy flow, light drips, or sudden sneezes.

Then there’s the super-absorbent middle. This layer is engineered to collect and trap moisture, neutralizing odors and locking away leaks. No more scrunching up napkins at your desk or worrying about sitting through meetings—the tech does the heavy lifting for you.

Finally, the protective outer layer acts as a last line of defense. This high-tech fabric barrier (it’s in the weave) stops leaks from escaping, all while remaining breathable and stretchy, so you can move, stretch, and sleep in total confidence.

It’s this three-part system—wick, absorb, protect—that makes your leakproof underwear so effective (and so much comfier than the alternatives). Just think of it like a trusty sidekick, designed to back you up through life’s messiest moments, without ever letting leaks get in your way.

Pre-Rinse Basics: Handling Fresh Stains

When it comes to making your leakproof underwear last, one of the most important steps is what you do right after you take them off. Handling fresh stains promptly not only helps prevent lingering odors, but also fights off those stubborn set-in discolorations that can shorten the life of your favorite pair.

Start by rinsing your underwear in cold water as soon as you can—cold is key here. Hot water can actually cause blood proteins to set into fabric, making stains more difficult to remove. Either hold the fabric under a running faucet or fill a sink with cold water and gently swish the underwear around. If you’re dealing with a heavier stain, let the underwear soak for about 10–15 minutes. This allows the water to dilute and lift away much of the blood or fluid before it dries. (Chemistry and Biochemistry Research Project)

Gently press (don’t wring or twist) the underwear to help release excess water and, with it, any remaining residue. If you notice the stain isn’t lifting, you can softly rub the area with your fingers. Avoid using bar soap, harsh detergents, or bleach at this stage—they can damage the fabric’s fibers and compromise absorbency. A gentle, fragrance-free soap is safe if you need a little extra cleaning power.

Remember, this quick rinse routine isn’t just about hygiene. It sets up the rest of your wash for success, ensuring your period underwear comes out fresh, clean, and ready for its next wear—no evidence left behind.

Cold Water vs Warm Water: Which Wins?

When it comes to period underwear, a little care goes a long way toward preserving softness, absorbency, and keeping things smelling fresh. One of the biggest questions you’ll face is whether to wash your period underwear in cold water or warm water. Here’s the honest breakdown.

Cold water is the MVP for protecting delicate fabrics and maintaining the integrity of leakproof layers. When you rinse or wash in cold, you’re preventing stains from setting and avoiding breakdown of high-tech fibers that make period underwear so effective. Cold water also minimizes shrinking and color fading, so your favorite pairs stay looking and feeling new—no matter how many cycles you put them through. (National Library of Medicine)

Warm water might sound like the answer for heavy-duty cleaning, but it has a hidden downside. While it can help dissolve certain stains, it’s also notorious for “cooking in” protein-based stains like blood, making them harder to remove. Plus, repeated hot washes can weaken performance fabrics and leakproof barriers, leading to reduced performance and longevity over time.

So, when choosing between cold and warm, cold water is almost always the safer bet. For best results:

• Rinse underwear in cold water ASAP after use

• Machine wash with cold on a gentle cycle

• Steer clear of bleach and fabric softener—they’re tough on the technical fabrics and can leave a residue that impacts absorbency

Bottom line: Cool wins out for keeping period underwear fresh, functional, and reliable—all period, all leak, every time.

Detergent Dos and Don’ts for Period Underwear

Choosing the right detergent is a game-changer for extending the life of your period panties and keeping odors at bay. While it might be tempting to toss your leakproof undies in with your regular laundry and call it a day, taking a little extra care with your detergent can mean the difference between a fresh, reliable garment and one that’s ready for early retirement. Here’s how to get it right:

What to Use

• Mild, Fragrance-Free Detergents: Opt for gentle, fragrance-free, and dye-free detergents as your go-to. Harsh additives and strong scents can irritate sensitive skin and linger in absorbent fabrics, making it tough to clean them fully.

• Detergents Designed for Sensitive Skin: Sometimes labeled as "hypoallergenic," these detergents avoid heavy chemicals that can damage the absorbency.

• Just Enough—Not Too Much: Less is often more. Using too much detergent can cause buildup in the fabric, making it harder to rinse out and potentially trapping bacteria and odors.

What to Avoid

• Bleach & Fabric Softeners: Both are a big no-go. Bleach breaks down fibers and absorbency, while fabric softener coats the material, reducing its ability to soak up leaks.

• Heavy-Duty Stain Removers: Most leakproof panties are built to resist staining, but strong chemical removers can eat away at the fabric’s integrity.

• Detergents with Oils or Additives: These can leave residues behind and compromise the leakproof layers over time.

• Drying in the Dryer: Saalt Wear leakproof underwear are made with premium cloth and are considered a “performance fabric.” All performance fabrics, whether that’s leakproof underwear or yoga pants, should always be hung to dry to maintain performance and integrity. 

Quick Pro Tip

Always double-check the detergent bottle for any residue left in your washer after use. Give your detergent drawer an occasional clean to ensure nothing interferes with the performance of your period underwear. Small steps, big peace of mind.

Skip the Bleach and Fabric Softener

When it comes to caring for your period underwear, what you don’t use is just as important as what you do. Bleach and fabric softeners might seem like powerful cleaners, but they can actually do more harm than good. Bleach is a harsh chemical that can break down the special leakproof layers in your underwear, causing them to lose absorbency and fit. Over time, this means your trusted pair won’t keep you as dry or comfortable.

On the other hand, fabric softeners coat fabrics in a thin layer of chemicals to make them feel softer, but that layer acts like a shield—trapping odors and making it harder for your underwear to absorb moisture. You might notice that old or miswashed underwear starts to smell, hold stains, or just doesn’t function as well as it used to. It’s no coincidence.

To keep your leakproof underwear working—and smelling—its best, steer clear of these laundry additives. Instead, stick to gentle detergents without strong fragrances or additives. Your underwear (and your future self) will thank you.

Hand-Washing Tips for Delicate Styles

When it comes to the most delicate period underwear—those lacy cuts, ultra-light fabrics, and high-absorbency layers—a bit of extra care pays off big time. Hand-washing not only helps your favorite styles last longer, but also keeps them feeling (and smelling) fresh, wash after wash. Here’s how to do it right:

1. Rinse fast: As soon as you take them off, give your underwear a quick rinse in cold water. This helps prevent stains and reduces any lingering odor.

2. Soak, don’t stew: Fill your sink or a clean basin with cold water. Add a small amount of gentle, pH-neutral detergent. Submerge your underwear and let them soak for about 30 minutes. Swish them around every so often—but no aggressive scrubbing! Too much friction can mess with the leakproof layers.

3. Spot-treat gently: If you see a stubborn spot, use your fingertips to gently rub in a little more detergent. Avoid harsh brushes: they wear out fabric and elastic fast.

4. Rinse thoroughly: Drain the soapy water and rinse each pair under cold running water until the water runs clear and all detergent is gone. Any leftover soap can irritate skin and shorten the lifespan of your underwear.

5. Skip the wringer: Whatever you do, don’t twist or wring out your underwear. Instead, gently press out excess water between your palms. Afterwards, roll them up in a clean towel and press again to soak up any remaining moisture.

6. Air dry only: Lay your underwear flat to dry, ideally out of direct sunlight and away from heat sources. Hanging can stretch out delicate fabrics and heat can break down technical fibers.

By making hand-washing part of your routine for your most delicate pairs, you’ll keep them looking newer, lasting longer, and smelling fresh—for every cycle and every stage of life.

Keep Your Saalt Period Underwear Fresh, Clean, and Long-Lasting

Washing your period underwear the right way isn’t just about keeping things odor-free—it’s about protecting your investment and reducing waste, cycle after cycle. Taking a few extra minutes to rinse in cold water, choose gentle detergents, and skip the heat means your Saalt leakproof underwear will continue supporting you, no matter where life takes you—through postpartum recovery, active days, and those unpredictable moments when you need backup the most.

Remember: Saalt designs premium underwear, without PFAS, and is carefully created for all bodies and all ages. By showing your period underwear a little TLC, you’re not just caring for yourself; you’re also participating in a movement for sustainability and period equity. We believe no one should have to sacrifice comfort and confidence for protection. With these simple washing tips, you can count on your Saalt underwear to have your back (and your front!)—without damage, odor, or hassle.

Saalt is more than a product—it’s peace of mind, confidence, and a commitment to a better world. Every pair you care for, every wash, brings us all a step closer to waste-free periods and bladder leak protection that keeps up with you, for years to come.

Read Also:

• How to Wash Period Underwear

• How Long Can You Wear Period Underwear? Experts Weigh In

• How Long Do Period Panties Last? Lifespan And Care Tips

Frequently Asked Questions About Washing Period Underwear

What is period underwear?

Period underwear is specially designed leakproof underwear that absorbs menstrual flow, bladder leaks, or discharge. Brands like Saalt offer them in a variety of absorbencies, styles, and sizes—so you get comfort, coverage, and confidence, whatever your needs.

How does period underwear work?

Period underwear works thanks to multi-layered, moisture-wicking fabrics that trap liquid and lock away odor, keeping you dry and comfortable. Saalt’s period underwear is designed without harmful PFAs in the finishing process, so it's gentle on your body and better for the planet. Here at Saalt we have a great page to learn how do period underwear work. 

Is it safe to wash period underwear with other clothes?

Yes, you can wash your period underwear with other clothes—just give them a quick rinse in cold water first to remove excess fluid. Saalt’s leakproof underwear is built tough, but you’ll help them last longer by skipping bleach and avoiding fabric softeners.

Should I rinse period underwear before washing?

Absolutely! Rinsing your period underwear with cold water right after use helps prevent stains and reduces odor. A quick rinse sets you up for an easy, efficient machine or hand wash.

Can I use hot water to wash period underwear?

It’s best to avoid hot water. Use cool or cold water when washing period pants; hot water can set stains and break down the leakproof technology more quickly. To keep your Saalt underwear at peak performance, always use cooler temperatures and a gentle detergent.

Sources:

1. Azeez Mutiu O. (2025). Blood Stain Removal: A Chemical Perspective on Set Stain. Chemistry and Biochemistry: Research Progress Vol. 6, 15–24. https://doi.org/10.9734/bpi/cbrp/v6/5322

2. Abney, S. E., Ijaz, M. K., McKinney, J., & Gerba, C. P. (2021). Laundry Hygiene and odor Control: state of the science. Applied and Environmental Microbiology, 87(14), e0300220. https://doi.org/10.1128/aem.03002-20