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      12-29-2012, 04:14 PM   #22
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Drives: 2009 335i Sedan
Join Date: Nov 2012
Location: Texas

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I work in a refinery and we use walnut shells to clean turbine blades, especially on our flue gas power recovery train (kind of a huge turbocharger). Basically the walnut shells are abrasive enough to clean off deposits but aren't abrasive to damage the metal. It really is amazing how well they work, I had no idea people had applied this to cars until I just read this thread though.
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