If the product says it is for cleaning guns, and there are no warnings about polymer guns, which are quite common these days, it better be safe to use on your Glock. I would think that if it did affect it, you would have a pretty good case against the manufacturer. If you can win a case in court because you spill coffee on yourself and get burned, you danged sure can win a case if their gun cleaner dissolves your gun! And I don't recall any warnings in the instructions I had when I had Glocks, about the gun being sensetive to gun cleaners. I am sure that you could whip up some kind of chemicals that would attack it, maybe sulfuric acid or something, but they don't put that in gun cleaners. This is assuming you read the fine print on the stuff you bought.