I never had a problem on anything from mag wheels to hub caps. Just in case, try it in a small spot or on an older rim. Also, for carpet and floormats, even rubber mats that 50/50 purple power and greased lightning mixture worked great! Due to the amount of the cleaner I used. I just mixed bottles in an insect or weed killer pump sprayer. Soak the floormats down and let them set, then just took the pressure washer and sprayed them off. Worked like a charm. Of course on carpet, you would have to use a small pump sprayer and soak the area, then I used water and a brush, scrubbed the area then used the wet vac.
Wheeew, now that I look back at it, it's amazing how dirty some of those vehicles are that are traded in.