First, be sure that it is completely cool before cleaning it. Because salt blocks can retain heat for a long time, you may need to wait hours after use to clean it.Two nevers here are: never submerge your salt block in water, and never use soap on it. If your block has food stuck to it, use a green scouring pad or soft-bristled brush to remove the food particles. Then use a damp — not wet — sponge or cloth towel to wipe down the cooking surface. To finish off the cleaning process, use a dry towel or paper towels to completely dry the block.