When we took ownership of a 20 year old Fleetwood Niagra, it was in great condition overall. There were just a few stains on the canvas that needed to be addressed. I used Zeps Mold Stain & Mildew Stain Remover in the areas over the beds and with a little elbow grease, it worked great! I poured some remover in a small plastic cup (to avoid any drippage), dipped a small grout brush into the remover and scrubbed away. Some areas needed more attention than others, but it got the job done!