I had a deck rebuilt last year and I used a contractor referred by a friend of a friend.
I was not happy with the job the guy did, but 10 grand later here I am. The guy suggested not to use trex or azek, they're all overpriced he said, use the Lowe's brand of decking for a fraction of the price. I agreed. No clue if that has anything to do with this situation or if this is normal for composite decking. I replaced a wood deck, mahogany, and I wanted to use mahogany again, but he suggested otherwise.
Anyway, 1 year later my deck has what looks like water spots all over it. I thought it would be maintenance free, but apparently not. I'm just hopeful I can get the spots out.
My first inclination was to get my pressure washer up there and run it over the deck, but I was told that is not a good idea and voids whatever warranty the product has - despite potentially damaging the deck.
Based on my quick internet searches I can't tell if this is tannin, or just something else expected, but I just want to know how to remove them.
Picture below, any suggestions?