Need owner feedbacks on Power Washer such as Dewalt DXPW3425. How high can it reach and how to deliver cleaning solution?

I don't have a dewalt but those specs sound similar to the one I do have, it won't throw the high pressure 40 feet up let alone the low pressure soap applicator

the peak on my house is about 32 feet and it won't reach the top without me getting on a ladder

for the second floor eaves I rigged up some copper pipe, a shut off valve and a spray nozzle that I hook up to the garden hose, this gives me additional reach so I can just walk around the house with it to hose it off but I don't have a sloped lot, you'll need a ladder or some scaffolding you can work from.

if I had mildew or moss growing on the siding I think I would want to use a soft bristled brush, like for washing a car, to apply the soapy mildew killing solution so I could also scrub it a bit and then rinse it with the washer

In Home Depot, they sell an 18 ft extender. I read some reviews and people said it is quite hard to handle physically but it maybe my only choice. Thanks for your information.