what to use to clean engine

[glassdoctor]

If you have access to an air compressor, one thing my buddies swear by is to use a light sprtiz of simple green... then blow it off... then a light spray of WD40...and blow it off.

This gets the it clean, protects from any corrosion, and makes it look like new.

This may not work for a neglectly filthy truck, but it works great if you do it regularly.