Although our sponge provides a powerful scrub, it does not leave a scratch on the surface. The material of the scrub is soft and made so that it could be used on any surface. For sensitive surfaces, you do not have to buy a separate sponge. This one will do just fine, without destroying the surface even a speck. Being made of soft material, however, does not mean it cannot handle tough surfaces. It can clean them both alike without an issue.