Another vote for Westleys. I have used it for decades. Great stuff. I spray on and use a bristle brush. Makes the white letters white and the black tire black!X3 or 4 for the Westleys as it does work well and also on house items.... Back in 1959 my uncle had a new Plymouth Conv. and he used ajax with a brush to clean the white walls and one of those large bars of ivory soap on the white conv. top. Another item that might assist is good ol' Clorox Bleach. Had some water stains years back in the plastered ceiling from leaks due to snow melting/freezing on our roof. That bleach treatment worked fairly nice. What the heck Marty, I'd try some bleach on a Q-tip and see how that works.