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Water stained aluminum supercharger

I have a polished aluminum supercharger...and it has what looks like water stains on it..i have tried several polishes, and even rubbing compoun but they don't go away..any suggestions..thanks

also..have same problem with alloy wheels

Tom Richardson
ram - Miami, Florida
2005

2005

Try a Mag Wheel Cleaner from the auto parts store. Choose the one containing hydroflouric, nitric & phosphoric acids. Wear rubber gloves ⇦this on eBay or Amazon [affil links] , goggles ⇦this on eBay or Amazon [affil links] and don't breathe the vapors. Let dry then polish.

Bob Elmore
- Cary, North Carolina

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