To deep clean a wooden cutting board, start by rinsing it with hot water and using a sponge to remove as much debris as possible. Then, sprinkle coarse salt on the surface and rub a lemon half over it, squeezing to release the juice as you go. Let the mixture sit for a few minutes, then rinse with hot water and dry with a clean towel. For tough stains and odors, create a paste using baking soda and water, apply it to the cutting board, and let it sit for 10-15 minutes before rinsing clean. Finally, use a food-grade mineral oil or beeswax conditioner to keep your cutting board moisturized and protected.