How to Remove Mold From Wood

A small patch of surface mold on solid, finished wood — say, a window sill or a piece of furniture — is often something you can handle yourself. But if the mold covers more than about ten square feet, keeps coming back, or has penetrated into porous or structural wood, that's a job for professionals.

Wear gloves, eye protection, and an N95 mask before you start, and work in a ventilated area. Mold disturbed during cleaning releases spores into the air, so protecting yourself matters even for a small job.

Start gently. Vacuum the area with a HEPA vacuum if you have one, then scrub with a mix of dish soap and warm water using a soft brush. For finished wood, this often lifts surface mold without damaging the finish.

For tougher spots, a solution of white vinegar — or a diluted detergent designed for mold — works better than bleach on wood. Bleach mostly removes the color while leaving the roots behind, and it doesn't penetrate porous surfaces well. Dry the wood thoroughly afterward, because lingering moisture invites the mold right back.

If mold returns to the same spot, cleaning was never going to fix it — there's a moisture source you haven't addressed. Wood holds water, and as long as it stays damp, mold will regrow no matter how many times you scrub.

Look for the leak, condensation, or humidity feeding the area. In crawl spaces and basements, the culprit is often ground moisture or poor ventilation that needs a vapor barrier or dehumidifier, not another cleaning.

Once mold has worked its way deep into porous or structural wood, surface cleaning won't reach it, and the wood may also be weakened by rot. In that case, the affected material needs to be removed and replaced.

This is where a professional assessment pays off. We can tell whether wood is salvageable or compromised, remove what can't be saved safely, and fix the moisture issue so the repair lasts.