Water-based formulation removes stubborn dirt and grime without leaving residues that spoil waterproofing. Nikwax Cleaning Gel is safe to use on footwear with waterproof breathable linings and waterproof leathers. Ideal for all footwear (smooth leather, suede, nubuck or fabric and leather combinations. Recommended for use on Gore-Tex® and Sympatex® lined footwear.