mean green and a parts brush then a wash away with water. Dont use anything too caustic on it.
or for just the valve covers a can of cheap brake cleaner spray.
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2012 BMW X5 (Beef + Granite suspension model)
1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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