It gets the brown off, Hapic X10, I have some hydrochloric acid that works (same stuff as in toilet bowl cleaner) just nastier. But it leaves the surface as dull as it was.Apparently toilet bowl cleaner works really well at restoring. No seriously! I have seen a couple guys do it with amazing results. Look it up
I will look into that.I bought some metal cleaner from Chemicalguys.Plus a set of SMALL buffing wheels(some are cone shaped).Works great at getting in between the downpipes and the rest.I then use a simple cotton cloth to remove the used cleaner.Pipes looked factory new except for a light gold at the exhaust header area.Will remove the bluing as well.
I've got an Akra muffler on there,think it's titanium so I just use warm water on that.
The Autosol for stainless is much less work than the standard Autosol. I too am curious about the vinegar. That may help cut through the brown oxidation. Hmmmm.What does the vinegar do? Get rid of stains on it?
I have used Autosol as well but find it needs a lot of working in to get a good result, unless I'm not putting enough work into it!