First of all, I think that we all can agree that if we lived in a different society, the people who are marketing and selling TimberTech as "low maintenance" decking would be lined up against a wall and shot. And we'd all go to watch.
That said, here's the best cleaning regimen that I've found:
(1) Use Corte Cleaner (a powder, recommended by TimberTech; available at Lowe's for $25 per bag) according to the instructions to clean off surface dirt, mildew, etc.
(2) Then, for problem areas (on my deck, almost all of it), wet the deck with the cleaning solution, then sprinkle some of the powder around. But, instead of scrubbing it by hand on your knees (as the Corte Cleaner instructions seem to suggest), use an ELECTRIC FLOOR SCRUBBER/POLISHER. For me, saves hours of back-breaking work!
My wife donated an old Hoover to the cause; you can find them on eBay. Not perfect, but better than everything else that I've tried . . .
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