Auto Leather Gum Remover Kit Ap3.gs by Leather Doctor is formulated to remove chewing gum and other sticky substances. Leather Eraser-4 is a rubber eraser for traction removal and is used in conjunction with the penetrating, lubricating, and suspending the power of the Prep-7.7 followed by Cleaner-3.8 followed by Rinse-3.0. When leather is wet and dry again, it tends to be stiffer. Hydrator-3.3 relaxes stiff leathers before fat and oil replenish. Fatliquor-5.0 softens the leather when dry. Scent Protector-B+ imparts a non-stick, buttery feel to shield against sticky soiling.