Mahogany deck help
We installed a mahogany/cambara deck in august with a pretreated wood and it was already showing strange discoloration - mold or mildew or something - by a couple of months later. Any recommendations on how to clean it and then what to put on it? I've read that TWP 100 series is good. And should we sand it first or try to strip it somehow with a chemical solution of some sort? We're in CT and it's getting cold - wondering if it's better just to wait until spring, or will that cause deeper problems with the wood?
Thanks for any/all advice!