How can I clean our slippery deck boards?


Here in the Pacific Northwest, our wooden deck and steps can get very slimey and slippery. Is there a mild, natural cleaner that will do a good job, and not strip the protective water sealer?
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Check out "wet & forget outdoor". It's good for the green and black. I bought it at Lowe's. It is also sold by walmart.com & qvc. There's a great video on qvc.
I forgot to mention it’s slow acting but it works in time.