Re: Washing/Cleaning the engine bay?
Many , many years ago , when I was on the tools , we used to wash the engine , bulkhead , underneath bonnet , side panels etc . as part of any major service . We did it by hand with a long , thin brush , cloths and paraffin ( kerosene ? ) , which was then hosed off and then dried with air hose / engine heat . Prior to starting , we used to cover electrical items like distributor , alternator , fuse box etc . any vulnerable electrics with plastic bags . Then after road testing , a final check on plug leads and inside dist cap .( in those days ) for moisture before parking outside . If done carefully , with patience , it makes all the difference to car . Many a time we had problems with over zealous use of the hose , mainly with electrics and water to interior of car at times .Nowadays with all the electrics on modern cars , you got to be very careful or you can introduce all sorts of problems .But take your time and prepare car before you start and you should be o.k . Best of luck .