I used this on my new-to-me, 20 year old pop up camper. There was mold staining all over the interior vinyl and canvas and it looked pretty gross. One treatment with this (applied with magic eraser) and it was gone in under an hour. There are still a few places where the stains are much lighter but still there, but the package says stubborn/old stains may require additional treatment. Honestly, my camper looks white again, not salt and pepper. I’ll add pics when I get finished setting it back up after washing everything.