Originally Posted by
noimagination
My bikes are currently in a basement room with unpainted drywall, but at some point I may want to paint the walls and I might need to remove some tire marks, chain lube stains, and the like.
Are the joints done and the nail/screw holes mudded and sanded? Was the base coats already put on the drywall. Drywall that hasn't been painted eats a LOT of primer. Meaning by the time you do a proper primer job, you've covered your bike tyre and lube stains without even bothering clean them. If you must, do the magic eraser. It won't matter after you get enough of a proper priming job done if you got too happy with the magic eraser at all.