Thetford's Ultrafoam Awning Cleaner provides a clinging foam that begins working on contact. The powerful foaming action keeps the awning cleaner on the surface longer, making your job easier. Special formulation safely removes tough leaf stains from fabric and vinyl awnings. Effective on bird droppings and sun-baked bugs. Its non-bleaching formula won't discolor fabrics and surfaces. Non-toxic, nonflammable, and 100% biodegradable.