I Agree with laddog54, equal parts of Simple Green concentrate, water, and iso alcohol does the trick, plus you may have the ingredients layIng around the house. I been using this recipe for a few years and it works great and so far, doesn't appear to affect the coverstock in any adverse way. Spray on, let sit for about 30 seconds, and wipe off well. Done.
I know it sounds like I'm in denial, but I'm not.