A do-it-yourself solution can save some bucks in the long run.
Most teak cleaners dont just clean; they also remove weathered woods surface fibers and expose new wood. As much as 0.010 inches of surface teak can be removed in a single cleaning when using some common teak-cleaning products. Regularly cleaning with these products will shorten a teak decks life. Some also contain strong alkalis that can harm paint, caulk, and aluminum.