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Though I would post a picture of a local window washer and his E250 that has a cool set-up. At least I think so...
He has primary filters and a water softener that feeds a good sized storage tank. Then he has a gas powered pressure washer with a couple hundred feet of hose that that he uses to rinse windows and decks after they have been scrubbed.
The van itself is almost rust free too! Happy cleaning....