For regular cleaning, I use yellow windex to clean, then some sort of mothers wax and polish. The spray stuff works fine for in between waxings. I think mothers works better than turtle wax. Although turtle wax is a nice product.
In terms of your exhaust? get us some pics. But mabey you could clean them up with some sort of high grit sandpaper or steel wool and coat them with a clear exhaust paint. Not the best thing, but its cheap