Quote:
Originally Posted by TopKnot
Simple Green or LA's Awsome(Dollar store) are very good degreasers.
If your valve cover is aluminum and has any corrosion or oxidation a very good product if you can source it, is Flitz Industrial Strength Aluminum Preclean. About $15 for a 16 oz. spray bottle but it does wonders for things like intake manifolds, valve covers and other cast aluminum engine parts. It leaves a protectant film as well.
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x2 if you don't want to pressure wash. Simple green will etch aluminum if you let it sit long enough(hours...days...etc.)
LA's totally awesome seems like a gimmic but it's really strong.