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Definitely needs to be a pressure washer, but it doesn't need anything especially powerful; the one I used was a budget $80 version from Costco and it worked just fine. You can get a 18' fiberglass wand for $120~ locally, but if you're trying to do it on a budget a wooden pole strapped to a shorter wand might get the job done.
It's really quick and easy with the pressure washer, I've done it quite a few times and its definitely the way to go. It goes by very quick.
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