Pressure Cleaning / Steam Cleaning / Degreasing EFI Engines?????

Is it OK to use either or all of the following to clean a '89 EFI T3 transporter engine?
pressure / steam / degreaser spray & water jet

I have never needed to clean any thing other than carby engines so I'm a little unsure as to whether I will do any damage to any of the EFI components.

Is there any thing to stay clear of?

Can I start the engine while it is still wet from the cleaning process or should I wait until it dries?

look forward to your advice.

Cheers
Brendan

ive done it to one of my non vw mainstream cars b4
just cover up any fuse boxes and major electrical components with plastic bags
and dont blast the hell out of any of the fuel injection or electrical parts

yea what he said and i have done my caravel no worries