I don't have a lot of experience, and I'm still learning the basics. No problem though, right? I've found helpful folks on a few forums with all sorts of good advice and help. So, my first contribution back (so that someone else can find it by searching) comes at the expense of some finish. The story begins with me reading a thread somewhere (different forum, can't find the link right now) about cleaning the bolt of 10/22 rifles with Simple Green. Simple Green is a relatively laid-back sort of household cleaner. I clean all sorts of stuff with it, and even used it to remove wax and build up from my skis before before shaping the bases and re-waxing. Since the bolt cleaning on my 10/22 went so well, I decided to clean the bolt of my Ruger MK II pistol and the mainspring housing as well. Bad idea. As it turns out, a five minute soak in Simple Green stripped the black finish right off. I can't say exactly what sort of finishes it will and won't damage, but I will never use it again on anything but bare metal. Actually, I'll probably never use it again on any gun part, since I now feel incredibly foolish. The shame! I'll try to post pictures later, when I figure out where my camera is hiding.