I own a yacht detailing company in Seattle, where mold and mildew thrive because of all the rain we get, and after using many other mildew removers and cleaners in the past, we finally discovered Mold Off^® several years ago and that’s all we use now. Other mildew cleaners with bleach in them are too strong and can actually do damage over time, but Mold Off^® is mild enough to leave on canvas or other materials without needing to rinse it off while it does its job removing the mildew and keeping it from coming back. My whole detailing crew is equipped with Mold Off^® and it’s the only mold and mildew product we use anymore. I highly recommend it if you want clean canvas free of mildew!