Thread: Valve Cleaning?
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      11-21-2012, 01:57 PM   #2
JDM NA2
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Drives: 09 335i e90 M-Sport
Join Date: Oct 2012
Location: CA

Posts: 68
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It's called walnut shell blasting. Check out this link.

http://www.e90post.com/forums/showthread.php?t=732369
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