Well, that’s overdue, but to be honest a lot of dry cleaning solvents are either toxic (Chloroform, Triclor) or greenhouse gasses (1,1,1 Tricloroethane, Freons), and most if not all come from petroleum sources. Unfortunately, we need them, or replacements anyway, for things as varied as whiteout correction fluid, industrial degreasers, and household cleaners. Finding cheap ways to make substitutes (like limonene, lactates, acetals) from natural sustainable sources is a huge challenge.