Our original grips are made of natural rubber which has many advantages; water repellent, excellent wear, and great feel.
However, to maintain these qualities, regular care is necessary. PGA players who have used them for over a year, and love them, regularly wipe them down each time after use. If after wear, exposure to elements and collection of hand oils and dirt the surface becomes smooth a real scrubbing may be necessary. In this case, a scrubbing with brush and soap or with a Brillo pad, rinsing and wiping dry will restore the surface like new.
Hope this helps.