It has been said that mineral spirits is the base for a lot of gun cleaners and is a much cheaper option for those that like to shoot a lot. I used it to clean and refresh a press that was in bad shape and it looks nice. In the video he was restoring a 7.7 jap and it ate the rust up. Is anyone else doing this and is there any problems with the glock polymers. Hate to melt or screw up my handle.