Hello, I purchased a new Glock 22 on Thursday. I cleaned it when I got home, as I do with all firearms I purchase, and noticed while wiping down the slide that there was a rusty brown colored stain appearing on the rag I was using. I use white lint free rags, and it was a clean rag prior to this point. I scrubbed on the slide for some time and continued to see this. I applied a liberal amount of CLP to the slide and used a clean brush to scrub it down and let it sit for about a half an hour before wiping it off with a clean rag. After doing this, I'm not longer seeing any of that rust colored residue on the rags, and hopefully I won't again. This particular weapon was assembled in Austria (Austrian Proof Marks) and I was wondering, since that's the case, could this residue have been some sort of protectant that they put on it? Has anyone else seen anything like this on their Glocks? Thanks.