Soak the bumpers in warm soapy water, scrub a little with an old toothbrush, rinse, and then wipe them off. If they are cracked, replace. They only cost a couple of bucks each so order a few extras to store inside your table along with a few extra men of each color and roll pins. Nothing worse than having to stop playing for a few days while you wait for a replacement bumper or man to arrive.