Fabsil Universal Cleaner is a water-based and biodegradable liquid which does Powerful deep cleaning, ideal preparation for re-proofing. There is no point applying a fresh water repellent treatment to dirty fabric - whether thats a tent or outdoor furniture covers. Without prior cleaning, the DWR treatment sticks to the dirt on the surface of the fabric, and when it falls off - so does any water repellancy. Fabsil Universal Cleaner is a mild detergent with a great cleaning action that removes dirt from the surface of all fabrics without leaving behind any residues that can effect subsequent treatments.