How do you clean up hair dye stains?

My girlfriend got hair dye on her glasses when she got her hair colored, i sprayed some brake cleaner on a rag and it wiped the dye right off, i imagine it would work on many surfaces I got black hair dye on my ultra suede kitchen chair.... help.... I haven't done anything yet for fear that I may just smear it and make it larger... I don't know what to use on it????