I was cleaning my SD and trying to find a way to get the gunk out of the spring in the frame in the front of the mag well. In my all metal guns I use brake cleaner. Leaves no film and gets the gunk out that's hard to reach. But I'm leery abut using it on the poly frame.I have an Outers spray but it says not to use on poly guns. Most comes out with compressed air just not all. No function problems just don't like a dirty gun.