Small particles of debris can work their way into the pores of leather causing it to dry out and deteriorate. To prolong the life of your boots, without damaging the waterproofing, we recommend using our Leather Cleaner by Lexol. It utilizes a foaming action that removes unseen grime and oil-based particles. How to: With a wet rag, soft brush, or sponge, apply the leather cleaner to the leather while it is still wet. Rinse off the excess with water and air dry thoroughly.