EARTHWORM Mold Treatment removes mold stains, from virtually any porous or nonporous surface, both inside and outdoors. The result is a truly clean surface. Natural bio enzymatic process. No Fragrance. No harsh chemical residues. EARTHWORM products use a naturally occurring process to break down organic materials. All living things contain enzymes. Our bodies use about 75,000 of them to help perform tasks like breathing and digesting. We've harnessed these enzymes to break down food, grease and almost any other organic material. Enzymes act as a biological catalyst to increase the rate organic material is broken down. Instead of scrubbing, the natural bio enzymatic process does most of the work, which is why we say, "let the worm do the work." And when the task is completed, no harsh chemical residues are left behind.