I've gotten ATV's and dirt bikes that have had rattle can paint jobs on the plastic which is pretty easily removed with a rag and lacquer thinner, which had little effect on the plastic. I'd guess it would be most dependent on what type of paint was used to paint the lizards but most any high quality solvent based paint should stand up to a little lacquer thinner but will likely require some polishing and wax afterwards. Of course it would be best to test on the original paint somewhere inconspicuous first, good luck.