Right on LB, there is no reason to remove the CPC (Corrosion Preventative Compound), I just like to keep the engine clean so I can spot any leaks when they happen. But that's me, Mr. Anal, that's what my wife calls me and I hope she means it in that context
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And yes, if you feel like removing the cosmoline use a steam cleaner because it's melting point is only 115-125 degrees. It's like dried out Vaseline.