motor power washing

They make engine degreasers that come in spray cans. You spray your engine then use a sprayer to rinse everything off. I haven't used any in years, especially with the newer engines that just don't seem to get 'that' grimy any more. Still, I will use a garden hose with a sprayer and spray down the metal area round the hood, the radiator, and any area I can reach with a hose and try to avoid running water over wires.

In older engines, if you got the spark wires wet, often times one or two of the spark plugs would foul out. In today's engines ... you can't even find the spark plugs!

I would not use a power washer on an automobile engine (car, truck, or Motorhome), but would not hesitate to spray with a garden hose, and avoid hitting wires.

tdgulfstream wrote:
(not anal but like to keep
it looking decent),

Ahem. Engines do not need to be clean for any other reason.
Really.

You likely will do more damage than good.

If it is mostly dust, blow it off with compressed air and then close the hood and don't worry about it.

Simple Green and a wide spray. You won't need much after the gunk has broken down

I never power washed my engine, but if I did I would use the lowest settings possible.

Older wires can break with the power of the washer, plus water can penetrate electrical connections and cause lotsa problems.

what I do is use pine oil and brushes (which not only cuts the grease but leaves a piney smell). Rinse just with your hose, at low pressure.