Somehow something got on my white rear seat back and bottom. Blotchy spots all over, from something like dirt, airborn grease, overspray, newspapers or whatever.
Tried dawn soap and wash cloth with no luck, then leather vinyl cleaner with no luck. Then a toothbrush and dawn soap, again no luck.
Tried dawn soap and a Mr. Clean Eraser pad. Bottom of seat is done, now will do the back tomorrow. This should even work on those black seats that you can't tell are dirty.