engine bays are fine to use a pressure washer on as long as you take extreme care

tip:
run engine to get warm not hot, then switch off!
apply chosen de-greaser/apc from a spray bottle starting with underside of the bonnet then moving down towards the engine,once your saticfied you've covered everything allow to soak for 5/10 mins remembering to re-apply to the areas that start to dry out from engine warmth!
then rinse off starting again from the underside of the bonnet moving down towards the engine keeping the lance at a distance
from the engine. keep the water away from alarm sirens and ecu housing,fuses etc the rest is fine to get wet as it will at some point in its life from water splashing up from puddles and driving in heavy rain.
turn on engine once you've fully rinsed it off, put bonnet down and allow to dry for 5/10 mins. once its all dry you can dress it
