A clean butcher block makes a bigger difference than you'd think. Here's the most effective method, plus the mistakes most people make.
Wipe up crumbs and food debris with a damp cloth after every use.
Sprinkle coarse salt over the block. Cut a lemon in half and rub the salt into the wood with the lemon. The acid and salt sanitize and remove stains.
Wipe with a damp cloth to remove the salt, lemon, and any debris.
For extra disinfection after cutting raw meat, wipe with white vinegar. Air dry.
Once dry, apply food-grade mineral oil with a soft cloth. Let absorb, then wipe off excess. Re-oil weekly to monthly.