newmar does have an option for power wash on KA, and likely will install on other units.
I found a small portable elec power wash with 1600 psi (??~ $450). more than enough for washing. it does have an adjustable nozzle. It also has adjustable pressure nob, so you can turn down the pressure. it is advertised to work with hot water upto 140f. I use it with the hot water supply to the gen bay. in the summer I run one AC element and in cold I run both elements and usually the water is around 70-90F, second year and it seems to work fine.
The DI, if you have room in the gen bay, here is where I have mine mounted.
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