Has anybody ever used CLR to clean aluminum castings? I am planning on rebuilding my SU's over the winter and prefer the "new" casting look to polished "chrome like" finishes. I have an old set of Zenith-Stromburg's I can try it on but thought I would ask you guys too. Thanks, Dave Connitt '67 TR4A IRS http://home.fuse.net/davestr4a