How to best wash a large deck?

Is it best to do this after a day of rain, when all the dirt might be loose, or is that asking for trouble with the wood being too soft?
(I've acquired a 13 HPDewalt pressure washer and am about to embark on cleaning my (cedar) deck, which is 70' wide and about 12' deep. I was planning to spray it down with deck cleaner I got at the big stores, and then pressure wash it on wide angle.)
If anyone has any other recomendation or help, please let me know.
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