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I wouldn't go near a Renault engine bay with anything more than a light sneeze. The electrics go of their own accord, let alone jetting gallons of water at them.
I usually go around the bay with Muc-Off and a MF towel, buff the inlets with some metal polish then wipe the plastics with trim detailer
Think it was powerwashed once shortly after I got the car - NEVER again! Well unless the electrics were covered up first but that is going to be a ballache in that bay!
However I have rinsed the sh*t out of the nooks and crannies (mostly the back of the strut turrets) with a bare hose and a few brushes before - came up a treat
Obviously the first thing is the engine needs to be cold / warm. I just use a bucket, car shampoo and cloth, wash all the main large visible bits, dry it with another cloth, then run the engine for a bit. Then i use a trim dressing and all done.
I also pressure wash engines daily. The only cars I haveproblems with are renaults. And occasionaly Ford Petrol engines as the plugs are right at the top.
I made the mistake of power the engine bay of one of my old clios. As said, a wet plug is a dead plug.... x4. It's ok to do, just keep the water away from the top of the engine.
I now use an adjustable attachment on the end of a hose and lightly spray agitated G101 off the bay on all my cars now.