I saved my pennies and bought a really cool industrial diesel burner steam cleaner. It is a cold or hot water pressure washer and a steamer. I have cleaned several engines and undercarriages and it works great. Don't even have to use any degreasing solution but, it does have a suction hose for it. I get going and don't want to stop. Something very satisfying about it. The only downside is it only takes a couple of minutes to get everything clean.

How does this help you? Find someone who has one, bring a six-pack, crank it up and have fun.