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Does anyone know of anything that will brighten the valve cover and other metal parts on the engine in my 240D? They have darkened with age. I tried an aluminum wheel cleaner but it didnt work. Thanks! Cliff
 

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There's a couple really good metal polishing pastes out there. I can't think of the names at the moment, but one of them is blue and it's non-abrasive. That's the one I use the most, it did wonders on the valve covers on my Gold Wing.
 

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89 Mercedes 300E, 91 Mercedes 300CE, 71 BMW turbo 2002, 73 BMW 2002tii, 85 BMW 635csi
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NAPA sells aluminum brightener which worked pretty well for me.
 
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