What I have found is that the stuff we used to call mineral spirits--mainly naphtha--is NOT available in California retail stores. The replacement product is mainly acetone. Check the MSDS for the exact ingredients. Acetone may or may not be the ideal solvent for cleaning rims; that depends on what's on the rim. Traditional rim cement is not very soluble min acetone but it is in naphtha. I can't say what works best for recent rim tapes.

One legal place to buy naphtha, and cheap: Your sporting goods store. Coleman white gas fuel, as someone from the UK said earlier.