For cleaning up stainless headers and exhausts, don't use anything abrasive or scratchy.
Go buy some Harpic "5x" extra strength toilet cleaner. paint it on with a brush, let sit 10 mins, then rub it with a damp cloth and hose the rest off if necessary. Rinse and repeat.
https://www.youtube.com/watch?v=ZXcM6g-JaBo
Finish off with Autosol metal polish. Only slightly abrasive but practically neither here nor there.
You can thank me later.
The active constituent you are looking for here is Phosphoric acid (not hydrocchloric). This is great for cleaning corrosion/oxidation off non ferrous metals. Also its the food acid in coca cola, and yes that works too but gets a bit sticky.
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