I like to use a powerwasher 1-2x a season, staying well above the surface to not damage it. It doesn't take much pressure to remove dirt. While I have never tried it, if I were to use a detergent, I would start with dishwasher detergent in a bucket of water to avoid the bubbles. It just seems like too much work to me to wash the entire deck by hand.
IMHO,
EricF
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