Cleaning The Exhaust Pipes

[David.]

Autosol is also of German origin and used by BMW, http://www.autosol.com/aboutus.asp

[guest4915]

Happich "Semi-Chrome" is the best all around metal polish I have ever used. Expensive here in the States and not easy to find. Made in Germany, so y'all across the Pond may find it easier over there.
One mistake that is common ( I done it years ago too),is to use common steel wool. That leaves particles in the surface.....that rust! Use stainless steel or I sometimes use the 3M abrasive pads made of Nylon. I put the Semi-Chrome right on the wool or nylon and go at it. Then use a cloth for a final polish job. I have used 2000 grit sandpaper to get really bad corrosion off the pipes, but that takes a good bit of elbow grease to get polished up.
I have never seen any negative effect from using the slightly abrasive metal polishes on chrome.

Also very expensive here in the UK