1.Safe for use on wet or dry skin. Have a foot bath with warm water for 5-10 minutes to soften your dead skin, hard skin and callouses for better effect., 2..Don't rub to excess. Rub in a back-forth motion by following the steps. Pumice stone - steel foot file - sand paper. Do cleaning with brush as you like., 3..Apply foot lotion or cream to keep the softness after filing