How to Clean Baseball Caps and Headwear the Eco-Friendly Way

Baseball caps, beanies, sunhats, and headbands — we all have our favourite pieces of headwear that get plenty of wear and tear. Whether it’s your go-to cap for dog walks, a woolly hat that keeps you cosy through winter, or a favourite summer hat, these accessories often get overlooked when it comes to cleaning. But hats absorb sweat, oils, hair products, and everyday dirt, so giving them a regular refresh is essential.

The challenge? Cleaning headwear properly without damaging its shape, fabric, or colour. That’s where Bio-D’s Laundry Liquid, Washing Powder, and our Laundry & Stain Remover Bar come in. They’re tough on stains but gentle on fabrics — and always kind to the planet.

In this guide, we’ll walk you through the best ways to clean different types of headwear, the products to use, and tips for keeping your favourite hats looking their best.

Why Special Care is Needed for Headwear

Unlike clothing, hats don’t always cope well in a normal wash cycle. Baseball caps can lose their shape, beanies may shrink, and delicate fabrics like linen can become damaged if not handled with care.

On top of that, many headwear items sit directly against your skin and hair, which means they pick up oils, sweat, and sometimes makeup. Using gentle, plant-based cleaning products is the safest way to keep them fresh while avoiding harsh chemicals against your skin.

That’s why Bio-D’s Laundry Range is perfect — effective, hypoallergenic, and made with naturally derived ingredients. Every batch of our range passes strict quality control checks, so you can feel confident that even your most-loved cap or beanie is safe with Bio-D.

Step-by-Step: How to Clean a Baseball Cap

Baseball caps are a wardrobe staple, but they can quickly build up sweat stains around the band and dirt on the brim. Here’s the best way to clean them:

What You’ll Need:

• Bio-D Laundry Liquid
• Bio-D Laundry & Stain Remover Bar
• A soft brush or cloth
• A basin of lukewarm water

Instructions:

1. Check the label – Some caps are machine washable, but many require handwashing. If unsure, stick to handwashing to protect the shape.

• Spot-treat stains – Rub the Bio-D Laundry & Stain Remover Bar directly onto any sweat marks or dirt patches, especially around the inside band. Leave for a few minutes.
• Soak gently – Fill a basin with lukewarm water and add a small amount of Bio-D Laundry Liquid. Swish to create a mild soapy solution. Place the cap inside and soak for 10–15 minutes.

1. Brush lightly – Use a soft brush or cloth to lift any stubborn marks.
2. Rinse thoroughly – Rinse under cool water until all soap is gone.
3. Air dry – Reshape the cap and leave it to air dry naturally. Avoid using a tumble dryer or placing it directly on a radiator, as heat can warp the shape.

Pro Tip: Place the cap over a bowl or balled-up towel while drying to help it hold its shape.

How to Clean Wool Beanies and Winter Hats

Wool and knitted hats are prone to shrinking, so they need extra care.

Method:

1. Handwash only – Fill a basin with lukewarm water and add a capful of Bio-D Laundry Liquid or a small amount of Bio-D Washing Powder.
2. Soak gently – Place the beanie in the water and gently swish. Avoid scrubbing or twisting, as this can stretch the fabric.
3. Rinse carefully – Rinse under cool water until all detergent is removed.
4. Dry flat – Gently squeeze out excess water (never wring) and lay flat on a towel to dry. Reshape while damp.

Using Bio-D means you’re washing wool with a formula that’s free from optical brighteners, enzymes, and harsh chemicals, keeping the fibres soft and comfortable.

Cleaning Summer Hats: Straw, Linen, and Cotton

Straw Hats

• Wipe gently with a damp cloth dipped in a diluted solution of Bio-D All Purpose Sanitiser.
• Avoid soaking straw, as it can lose shape.

Linen or Cotton Sunhats

• Machine washable on a gentle cycle with Bio-D Laundry Liquid.

• Pre-treat any stains with the Bio-D Laundry & Stain Remover Bar before washing.

• Air dry to prevent shrinkage.

Everyday Freshness Tips for Headwear

• Rotate your hats – Giving them time to air out between wears prevents sweat build-up.
• Store properly – Avoid squashing hats into drawers; instead, store them in a breathable bag or on a hook.
• Use a mesh bag – For machine-washable caps and beanies, pop them in a mesh laundry bag before washing to prevent snags.

Why Choose Bio-D for Headwear Care?

Cleaning hats and caps isn’t just about keeping them fresh — it’s about doing it safely. Conventional detergents can be harsh, leaving behind chemical residues that sit against your skin when you wear them.

With Bio-D’s Laundry Range, you get:

• Plant-based, biodegradable ingredients
• Hypoallergenic formulas, kind to sensitive skin
• Effective stain removal with our Laundry & Stain Remover Bar
• Bulk refills (5L & 20L) to save money and cut down on single-use plastic
• Peace of mind, knowing every product is cruelty-free, vegan, and made in the UK

Keep Your Favourite Hats Looking Their Best

From baseball caps to winter beanies, summer hats to sporty headbands, your headwear deserves the same care you give your clothes. With the right approach and Bio-D’s eco-friendly laundry range, you can clean them safely, keep them fresh, and extend their life — all while protecting the planet.

Ready to refresh your headwear the sustainable way? Explore our full Laundry Range and discover the Bio-D Laundry & Stain Remover Bar, your go-to tool for tackling sweat and everyday stains.