The Professional Fine Grade Clay Bar is Dunking Biscuit's 200g decontamination bar, used to lift tree sap, bird droppings, metal fallout and salt that a normal wash cannot remove from paint or glass. Gloves are required when handling it, and the maker states it can be used on any surface or glass without the risk of marring when the correct technique is followed. Cut the bar into equal pieces, keep the panel wet with lubricant, and work it back and forth with light pressure, checking constantly for trapped debris. For best results, Dunking Biscuit recommends pairing it with their Lööb Clay Lubricant. Use it ahead of polishing or protection, once the vehicle has been washed and dried.