Engine bay washing

[Shane East <seast@home.com>]

What's the best way to wash everything under the hood? I'll be going to a
do-it -yourself car wash that has those power nozzles. No, I've never done
this before.
	>Someone recommended green gunk, if I recall. Is it better than Simple Green?
	>What components must be covered so it will start? Any tips better than bread bags?
	>Should different components get different cleansers?
	>Towel dry, or Highway dry?
	>what products do I buy to make that homemade silicone-spray protectant? 
	
TIA!
-SE-