As leather is naturally a porous material, you should prevent the leather straps from coming into contact with oily substances, solvents, detergents, or cosmetics. You should also limit its exposure to water regardless of whether the strap is water-resistant or not. By doing this you will be able to help prevent discoloration or premature aging of the material. To clean your leather strap, follow these steps: Remove the strap from your watch and use a dry microfiber gently wipe both sides. Doing this will ensure any trapped dirt will not scratch the leather. Next, dampen — do not soak — a microfiber cloth and apply a tiny drop of mild hand soap or saddle soap to the cloth (about the size of half a dime). Do not aggressively rub the leather back and forth; instead, use tapping movements and wipe in gentle circles, applying light pressure and paying attention to spots with dirt. With a second damp microfiber cloth, gently wipe (not rub) the leather clean. Don’t use too much water, as it can cause damage to the leather. Give the strap plenty of time to fully naturally dry before wearing it again. As an option, treat the leather with your favorite leather oil or conditioner to soften and protect it. keep it’s lustrous look. Just like skin, it can easily dry so it’s best to use a leather conditioner to keep it soft and supple.