I used to just wipe my wooden cutting board with a sponge and call it clean. Then I read about how much bacteria a used cutting board can harbor — more than a toilet seat, according to one study that I wish I had never seen — and suddenly the sponge wipe did not feel sufficient.

Wood is naturally antimicrobial, which helps. But “naturally antimicrobial” does not mean “magically self-cleaning.” You still need to deep clean it regularly, and you need to do it without warping or cracking the wood. Here is the routine that keeps mine looking and smelling fresh after five years of daily use.

The Everyday Clean

After each use, hot water, mild dish soap, and a scrub brush. Wash both sides — even if you only used one side, moisture and food particles migrate. Rinse thoroughly. Stand it upright to dry. Never let it sit flat on the counter in a puddle.

I keep two boards — one for raw meat, one for everything else. This alone eliminates most cross-contamination risk. The meat board gets washed immediately after use, every time.

The Weekly Deep Clean

Once a week, I do a three-step deep clean:

1. Salt scrub: Sprinkle coarse kosher salt across the board. Cut a lemon in half and use it like a scrub brush, squeezing as you go. The salt acts as an abrasive and the lemon acid cuts through grease and odors. Scrub for about a minute, then let it sit for five. Rinse with hot water.
2. Hydrogen peroxide or vinegar: Pour a small amount of 3% hydrogen peroxide or white vinegar over the surface, spread it around, let it sit for two minutes, then rinse. Both kill bacteria without harsh chemicals. Do not mix them — pick one. I use hydrogen peroxide after meat, vinegar after vegetables.
3. Dry completely: Towel dry, then stand upright. Do not put it away damp. Ever.

The Monthly Oil Treatment

Once a month, when the board starts looking dry and pale, I rub in food-grade mineral oil or a beeswax blend. Pour a small puddle on, rub it in with a paper towel in circular motions, let it absorb for a few hours or overnight, then wipe off any excess.

This prevents the wood from drying out and cracking. A cracked board is a bacteria trap and cannot be fully cleaned. I skip fancy “board creams” — plain mineral oil from the pharmacy works perfectly and costs three dollars.

What Not to Do

Do not put a wooden board in the dishwasher. The heat and prolonged water exposure will warp and split it. Do not soak it in the sink. Do not use bleach — it degrades the wood fibers.

If your board has deep knife grooves that trap food, it is time to sand it down or replace it. No amount of cleaning fixes a board with crevices.