I would like to try to "de-modernize" some modern lenses to give them a more gentle contrast without really sacrificing on detail. I've read threads about using toothpaste or cigarette ash to grind away the coatings, and I tried it it once with no success. Are there other options to remove modern coatings? I don't mind taking some risks, as I'm only doing this to junk cameras for now (ex: original Olympus Stylus). Thanks.