The Ultimate Guide to Washing Delicates, Swimsuits, and Activewear

Your favorite lace bralette, that high-performance yoga top, and the swimsuit you wore on vacation—these pieces require more care than your everyday cotton tees. Delicates, swimsuits, and activewear are made from specialized fabrics that can be easily damaged by harsh detergents, high heat, or rough washing cycles. The result? Stretched-out elastic, faded colors, and fabric pilling that ruins both look and function.

The good news is that with a few simple adjustments to your laundry routine, you can keep these garments looking and performing like new. In this guide, we’ll walk you through the best practices for washing delicates, swimsuits, and activewear—including the gentle detergents and tools that make the job easy. Whether you’re hand-washing a silk camisole or machine-washing your gym leggings, these tips will help you avoid common mistakes and extend the life of your wardrobe.

Why Delicates, Swimsuits, and Activewear Need Special Care

Delicate fabrics like silk, lace, and modal are naturally fragile. Their fibers can snag, tear, or lose shape when exposed to the agitation of a standard wash cycle or the harsh chemicals in conventional detergents. Swimsuits, meanwhile, are typically made from nylon, spandex, or polyester blends that are vulnerable to chlorine, saltwater, and UV rays. Without proper rinsing and gentle washing, the elastic can break down, causing sagging and loss of fit.

Activewear—think leggings, sports bras, and moisture-wicking tops—is engineered to stretch, breathe, and wick sweat. However, fabric softeners and high-heat drying can clog the pores of the fabric, reducing breathability and trapping odors. Using a gentle, plant-based detergent helps preserve the technical properties of these garments while keeping them fresh. By tailoring your wash method to each fabric type, you’ll save money on replacements and reduce textile waste.

• Always check the care label first—it provides the best guidance for water temperature and drying method.
• Separate delicates from heavy items like jeans or towels to prevent snagging.
• Avoid fabric softeners on activewear and swimwear as they can coat fibers and impair performance.

How to Wash Delicates: Hand-Washing and Machine Tips

For delicate items like silk blouses, lace underwear, and fine knits, hand-washing is the gentlest method. Fill a clean sink or basin with cool or lukewarm water and add a small amount of a mild, fragrance-free detergent. Submerge the garment and gently swirl it for a few minutes—never wring or twist, as this can distort the fabric. Rinse thoroughly with cool water until all soap is gone, then press out excess water by rolling the item in a clean towel.

If you prefer to use a washing machine, place delicates in a mesh laundry bag and select the delicate or hand-wash cycle with cold water. Use a gentle detergent like the Molly's Suds Baby Laundry Powder, which is formulated without harsh chemicals and is safe for even the most sensitive fabrics. Avoid bleach and optical brighteners, which can yellow or weaken fibers over time. Always air-dry delicates flat on a drying rack away from direct sunlight to prevent fading and shrinkage.

• Turn delicates inside out before washing to minimize friction on the outer surface.
• Use a dedicated mesh bag for each item to prevent tangling and snagging.
• Never put delicates in the dryer—heat can cause irreversible damage.

Swimsuit Care: Extend the Life of Your Swimwear

Swimsuits face a triple threat: chlorine, saltwater, and sunscreen. After each wear, rinse your swimsuit immediately with cool, fresh water to remove chemicals and debris. For a deeper clean, hand-wash with a mild detergent—avoid machine washing if possible, as the agitation can stretch out the elastic. If you must use a machine, place the suit in a mesh bag and use the delicate cycle with cold water.

A gentle, bleach-free detergent is key. The Molly's Suds Oxygen Whitener Bleach Alternative works beautifully to brighten whites without damaging spandex or nylon. Never wring out your swimsuit; instead, lay it flat on a towel and roll it up to absorb excess moisture. Dry it in the shade—direct sunlight can fade colors and weaken fibers. Avoid the dryer entirely, as high heat will destroy elasticity. With these steps, your swimwear will keep its shape and color all season long.

• Rinse swimsuits in cold water immediately after swimming to prevent chlorine or salt damage.
• Rotate between two or three swimsuits to give each one time to recover its shape.
• Avoid sitting on rough surfaces like concrete or pool edges to prevent snags.

Activewear Laundry: Keep Your Gear Fresh and Functional

Activewear is designed to wick moisture and resist odors, but sweat, bacteria, and body oils can accumulate over time. To keep your leggings, sports bras, and performance tops in top condition, turn them inside out before washing—this helps protect the outer fabric and allows the detergent to reach odor-causing residues. Use cold water and a gentle cycle, and skip fabric softener entirely, as it can clog the fabric’s pores and reduce breathability.

A gentle, enzyme-free detergent is ideal for activewear. The Molly's Suds 2-in-1 Original Laundry Powder with Oxygen Brightener BOOST combines a powerful clean with a natural oxygen brightener that lifts stains and odors without harsh chemicals. After washing, air-dry your activewear instead of using the dryer—high heat can break down elastic fibers and cause shrinkage. If you need to remove stubborn odors, add a half-cup of white vinegar to the rinse cycle. Your gear will stay fresh, stretchy, and ready for your next workout.

• Wash activewear after every workout to prevent bacteria buildup and lingering smells.
• Use a sport-specific detergent or a gentle, plant-based option for best results.
• Never use bleach or chlorine-based products on performance fabrics.

Tools and Accessories That Make Delicate Care Easier

Having the right tools on hand can simplify your delicate laundry routine. A mesh laundry bag is essential for protecting fragile items in the machine—use one with a fine weave for lace and silk, and a larger bag for swimsuits and activewear. A wooden scoop helps you measure the perfect amount of detergent without waste, while a soap saver can hold small pieces of laundry soap for hand-washing.

For drying, invest in a flat drying rack or a collapsible hanger with clips. Avoid wire hangers that can leave rust marks or stretch out straps. If you travel frequently, consider a portable drying line. These small investments pay off by extending the life of your favorite delicate and performance garments. Remember, the gentlest care starts with the right products and a little extra attention.

• Use a fine-mesh bag for delicates and a standard mesh bag for swimwear and activewear.
• A wooden scoop ensures you use the correct detergent amount—no guessing.
• Always air-dry delicate items flat to maintain their shape and prevent stretching.

Caring for delicates, swimsuits, and activewear doesn't have to be complicated. By using a gentle, plant-based detergent, washing in cold water, and air-drying, you can keep your favorite pieces looking and performing their best for seasons to come. Ready to upgrade your laundry routine? Explore the Molly's Suds 2-in-1 Original Laundry Powder with Oxygen Brightener BOOST for a powerful yet gentle clean that works on everything from silk to spandex.