How to Clean Boar Bristle Brush: Step-by-Step Guide (2026)

If your boar bristle brush has a grey, dusty film at the base of the bristles and your hair looks dull after brushing, the brush is the problem, not your hair. How to clean a boar bristle brush: pull out all trapped hair, swirl the bristles in lukewarm water with a drop of mild shampoo for a few minutes, rinse, shake off excess water and dry bristle-side down on a towel overnight. Never soak a wooden-handled brush — water swells and cracks the wood and loosens the bristles. A full clean takes about ten minutes of hands-on time, and your brush (and your hair) will thank you.

Boar bristle brushes are brilliant at distributing your scalp’s natural oils down the hair shaft, which is why they make hair shiny. But that same talent means they collect oil, dust, dead skin and styling product fast. A dirty brush puts all of that straight back onto clean hair. If greasy roots are a recurring battle, read our guide on how to fix greasy hair alongside this routine.

Step 1: Remove all the trapped hair

First, pull out every strand by hand. For stubborn hair woven around the base, slide a wide-tooth comb or a chopstick under the mat and lift it away, working in sections. Do this over a bin. This step alone makes a visible difference and should be done every few days, not just on wash day.

Step 2: Prepare a gentle cleaning bath

Fill a shallow bowl with lukewarm water — never hot — and add a pea-sized drop of mild shampoo or a gentle clarifying shampoo. Swirl to make light suds. Avoid harsh detergents, washing-up liquid or vinegar soaks; they dry out natural bristles and can damage wooden handles. If you want general hair-washing refreshers, see how to properly wash your hair.

Step 3: Wash the bristles (do not soak)

1. Dip only the bristles into the soapy water, keeping the wooden handle and cushion base as dry as possible.
2. Swirl the brush gently for 2-3 minutes, letting the suds work through the bristles.
3. Use an old soft toothbrush to scrub between the bristle rows where grey build-up hides.
4. Rinse by dipping in clean lukewarm water and swirling until the water runs clear.

Important: never leave the brush sitting in water. Soaking swells wooden handles, cracks the lacquer and loosens the bristle setting. A quick dip-and-swirl is all it needs.

Step 4: Dry bristle-side down

Shake off excess water, then lay the brush bristle-side down on a clean dry towel, ideally with the handle slightly raised so air circulates. Leave it overnight. Do not use a hairdryer on it — concentrated heat warps bristles and wooden handles. The brush must be completely dry before you use it again, or trapped dampness can cause a musty smell.

Step 5: Condition the bristles (optional, monthly)

Every month or so, after cleaning, smooth a tiny drop of lightweight oil (jojoba or argan) over the bristles with your fingers. This keeps natural bristles supple and stops them going brittle. Use far less than you think — a greasy brush defeats the purpose. For hair itself, the same principle applies in our guide to how to moisturize hair.

How often should you clean it?

• Every 2-3 days: remove trapped hair by hand.
• Weekly: the shampoo wash described above, especially if you use styling products or have an oily scalp.
• Monthly: the deeper clean with the toothbrush scrub and optional bristle conditioning.

When to replace your brush

Even a well-cared-for boar bristle brush lasts 6-12 months of daily use. Replace it when bristles are bent, broken or falling out in numbers, the cushion base is cracked, or the brush no longer grips and smooths your hair the way it used to. A worn brush tugs and causes breakage, undoing all its good work.

Tips

• Keep a second cheap brush for dirty jobs (like brushing out dry shampoo or backcombing) and save the boar bristle brush for finishing.
• Store the brush bristle-side up in a drawer or cupboard — bathroom counters collect dust and product overspray.
• Never share brushes; they transfer scalp oils, product and potentially scalp conditions.
• If the brush smells musty after washing, it did not dry fully — wash again and dry longer in an airy spot.
• Check the manufacturer’s care card that came with your brush — some brands, such as those listed on official maker sites, give specific guidance for their bristle blend.
• Patch-test any new cleaning product on a small area of the handle first if the brush was expensive.

FAQs

Can I use washing-up liquid to clean my boar bristle brush?

It is not recommended. Washing-up liquid is formulated to strip grease aggressively and will dry out natural bristles, making them brittle. A mild shampoo does the job without the damage.

Why does my brush still look grey after washing?

Grey film deep at the bristle base is usually compacted dust and product. Scrub between the rows with a soft toothbrush during the wash, and repeat the wash if needed. If it never shifts, the brush may simply be worn out.

Can I put a boar bristle brush in the dishwasher?

Definitely not. The heat and prolonged water exposure will ruin the wood, melt any glue and destroy the bristles. Hand washing is the only safe method.

Is it hygienic to use a boar bristle brush on oily hair?

Yes — that is exactly what they are for, since they spread oil along the hair. Just clean the brush weekly so it is not redepositing a week’s worth of oil and dust back onto your hair.

Do synthetic “boar-style” brushes need the same care?

Largely yes, though nylon bristles tolerate water better. You can be slightly less precious about drying, but the same no-soak, bristle-down routine keeps any brush in good shape. The NHS general guidance on keeping personal care items clean applies: regular washing prevents build-up of bacteria and fungi.

A clean boar bristle brush is one of the cheapest upgrades you can make to your hair routine. Ten minutes a week — hair out, quick shampoo swirl, dry bristle-down — keeps the brush doing its job: moving your natural oils where they belong and leaving your hair genuinely shinier. Treat it well and it will easily last you the year.