I haven't cleaned my deck in at least 3 years. If you let it go that long, the dirt and bacteria get really embedded in the wood. The job of cleaning it is taking a lot longer since it's been so long. My washer is electric, so it's medium to low power. While it takes longer, it doesn't damage the wood.
What I need to do is clean the deck twice a year - once in the spring and once in the fall. That way, it shouldn't take as long and the deck should look really nice all the time.
Watch out for raccoon poop.
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