Apply Birkenstock Water & Stain Repellent regularly to protect upper Leather, Suede and Nubuck from water and dirt. Brush uppers with a Nubuck/Suede brush to pull up dirt and dust and restore the nap. For Birko-flor and birkibuc uppers, simply wipe clean with a damp cloth. Try soap and water to remove stubborn stains.read more >>