Got vinyl siding which is in need of a wash to get rid of dirt and some
greenish mold. I like the idea of having my own power washer since there
are other occasional light jobs where it would be handy.

Can I wash the second story from the ground with one of the 1750 PSI
electric models that Home Depot and Lowes sell for around $170? (Power
washing from a ladder doesn't seem much fun, and the wife worries...)

If 1750 PSI isn't enough, how much is enough?

Thanks, Sam