Never heard anything like that, but I can't imagine ever doing it. It sounds like a bad idea IMO. It won't clean it thoroughly and may even damage something. I just can't see anything positive coming out of the experience. That being said, most firearms are very tough, but I still don't see the point.
I dunno about you guys, but I actually enjoy the time I spend cleaning my pistols. I know it might sound lame, but I think it creates more of a bond between you and your guns. Ok ok, it sounds really lame.