Best Solution for Exterior/Hull Washing

Alas, my 342FV had to be moored to the outside of my boathouse during the winter to allow cradle modifications. All is well now, but the boat desperately needs a serious cleaning... bugs, leaves, pollen, dirt, birds, all the stuff that interferes with a nice, clean, sparkling deck and hull! I have a small RYOBI 1700 psi power sprayer that holds soap, and using careful spray distance, there's hopefully no threat for gelcoat damage. But, before I do something unwise, I wanted to check with Forum members to see if anyone has found a sure-fire way to effectively wash their Rinker without hand-scrubbing ... (not an option with current back situation.) Thanks in advance!
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Dream 'Inn III -- 2008 400 Express