Good old soap and water
Wash with a bit of dish soap, rinse in hot water, wipe clean and allow to air dry.
Salt and lemon
Sprinkle the board with coarse salt. Scrub the salt into the board using half a lemon (fleshy side down). Let the salt and lemon solution sit for about five minutes then rinse the board with hot water and allow to air dry.
Mix one-part white vinegar to four parts water. Soak your board in the solution for a few minutes then rinse off and air dry.
Mix one tablespoon of bi-carb soda, one tablespoon of salt and one tablespoon of water to form a paste. Give your chopping board a good scrub with the paste, then rinse thoroughly with hot water and air dry.
When drying your cutting boards, place it in an upright position where air can circulate. This allows the board to dry out completely.