My husband and I just bought a 1997 Rockwood Freedom 1940 model. We have some gnarly rust stains that appear to be between the canvas. I’ve tried mold and mildew, ivory dish soap, Clorox and hot water. Nothing seemed to work. Thought about painting it but not sure how well that would hold up. Thinking of trying a salt, lemon juice, and warm water soak in the sun (if we ever get any here lol). Going to post a picture. All suggestions welcome! Thanks in advance!