A little while back someone has asked about something to clean an engine
with and a product called Greased Lightening was suggested.

A product I want to suggest - and a tip I got from TJ Hannik - is to use
a waterless hand cleaner like Orange GoJo or something similar - one of
the waterless hand cleaners. The stuff cleans up an engine really well.
You could dissolve some in water and use a pressure washer for
application - that works too - then wash it down after.

If you have road film or road grime on our vehicle, you can clean it up
nicely with this waterless hand cleaner.

Give it a try.

John