got a secondhand exhaust manifold
the stainless is tarnished
any ideas on how to clean it off?

tried sink cleaner, viniger

Stainless polishing paste and a mop wheel - Find a local metal polisher...

Waste of time, it will go brown again as soon as you fire up your engine!

Caber

The best way is to use pickling paste but very strong stuff, must take great care. Brush on leave 1 hour wash of with warm soapy water, use scotch bright or scouring pads, must dry with rag, this will also clean welds up aswell. Can be obtained from welding suppliers.

[Edited on 24/11/07 by madteg]

Don't bother!!

Or- autosol on a polishing mop (I've used one of the little polishing pads that came with my dremel-substitute before). Works well but comes back as soon as you fire it up....