Important: Your feet need some callusing to be healthy and protected. Please focus on smoothing your calluses rather than removing them. 

Soak your feet in warm, soapy water or use while in the bath or shower. Using the coarse side, gently rub the surface over thick calluses until they are reduced. Using the medium side, gently scrub off any rough spots. 

Your smoother can be washed with soap and water and left to air dry. It can also be scrubbed with a nail brush. A convenient hole in the handle makes it easy to hang on a shower caddy, too

Anyone suffering from diabetes or poor circulation should not use this or any other foot smoother.