civicclutch:
I`ve used Megs D101 APC since I found out about it on this forum about 6 years ago. it`s a great APC that works on minor to medium dirty clean-up of interiors and engine compartments and wheel wheels. For REALLY dirty vinyl I found Optimum`s Power Clean to work , BUT not for fabric or carpets (it DOES work on those!) because of the less-than-pleasant fragrance the seems to linger within the fibers of fabric and carpets (Optimum does make a fabric-and-carpet-specific cleaner). Some have tried the Orange-Citrus based cleaners/degreasers, like Zep HD Citrus Degreaser, but I have no experience using it on vehicles. Another APC that does not garner much attention is Bio-Kleen`s Amazing. If you are lucky enough to find an RV store that carries the Bio-Kleen line, they may order it for you if it is not in stock. I think the 16 oz spray bottle is about $16.00 retail and the gallon is around $30.00.
Your steamer is still the best way to clean in combination with a good APC, even if it takes a while to do so.