Originally Posted by megasaxon

all of my polished pipes i cook in an old crockpot full of classic green anti-freeze. remove your springs and gaskets and cook the pipe and header in there for a while, the longer the better. This will removed any baked on dirt and grime on the outside of the pipe, along with oils and such on the inside of the pipe.

Then i rinse them well and wash with simple green to remove any anti-freeze residue. Then you can use Mother Mag/Alum polish to finish them off nicely.