I use the spray clay and the bug scrubber on client vehicles that have hard water spots on their glass. The Shield part of the system is like Rain-X (IMO) so I stopped using that. I don't think it's acomplete waste of money as I've been able to clean up some bad glass (glass that wouldn't clean to clear with just Stoner's). But I might just get the regular sized spray clay, a Pinnacle Bug and Tar Scrubber (like a hard yellow sponge), and some Rain-X. Probably around the same price as the full system.
