[Landshark]

do not steam clean - the steam can find its way inside connectors and condense, causing corrosion later.

i use Foamy Engine Brite for the bad parts - use baggies and rubber bands to seal off electronikal type stuff (alternator, fuse box, etc.), and hose off with a LIGHT flow. stubborn stuff gets more Engine Brite and convincing with an old toothbrush.

cheap dollar store type protectant on the plastics.

Mother's Aluminum and Metal polish works good on some metallic surfaces under there, and doesn't smell nearly as bad as some other metal polishes.

don't forget to clean and wax the painted areas around the engine bay and on the bottom of the hood, too.