Thread: Valve Cleaning?
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      11-21-2012, 02:21 PM   #3
banky
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Drives: 2007 335i e92
Join Date: Jul 2011
Location: Houston

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Quote:
Originally Posted by JDM NA2 View Post
It's called walnut shell blasting. Check out this link.

http://www.e90post.com/forums/showthread.php?t=732369
thanks for the info!