Can white vinegar remove paint?
Also asked, does white vinegar harm paint?
Minerals will etch paint if water spots or cement stains stay on your car for more than a few days. Yes, using vinegar will remove the stains. But the paint may have etch spot (dimples) damage. The only way to fix this common problem is to polish the paint.
Also asked, how do you remove dried paint?
Dish soap and a safety razor blade can remove even old, dried-on paint. Mix dish soap with warm water until sudsy, and thoroughly wet the window with a sponge or rag. Hold the razor blade at a 45-degree angle, and carefully scrape the paint away, keeping the glass damp to avoid scratches.
If the dirt on your walls has crusted over and/or built up, you may need something a bit more abrasive than just vinegar and water. If your walls are painted, abrasive agents like baking soda may damage the paint, especially if it's latex-based.