Protect your investment with the Danner Boot Care System. Danner Cleaning Gel cleans without residues that can spoil waterproofing. This is just what you need to keep boots with full-grain leather uppers in great shape. For use on full-grain leather only. For nubu, suede or rough-out leather , use waterproofing spray before each use to prolong the life of the leather. 8 ounce bottle.