I'm not sure I'd suggest steam cleaning - - I'd think the high pressure might be counter-productive. Rather, I use 2 parts water to one part Simple Green cleaner- - environmentally friendly, non-petroleum based-- then sprayed on a warm engine.
There are certain components that common sense tells you to avoid--on a normally aspirated engine, I'd suggest covering the carb and distributor and anything else with exposed or open connections.
Hose it off thoroughly, then use pressurized air or a simple towel to wipe things down and soak up puddles in low places. I use tire foam or Armoral on all the plastic/rubber parts and painted surfaces except the accessory belts.
While there certainly may be folks who voice caution about spraying water on the engine and electrical components, in my view, it's simply a matter of using common sense. In most climates, we drive through standing water, ice or snow fairly often so most engine components are shielded or protected. I've used this practice about twice a year for many years on Corvettes, Hondas and Mercedes with (thusfar) no negative effects.
And absolutely nothing beats a damp rag with elbow grease on that gorgeous silver Vette! So, welcome to the Corvette Forum and best wishes for a Happy New Year !
Regards-
