Re: Black / gray deck spots - how to fix / prevent?
I just used starbrite deck cleaner for this very issue.
Spray full strength, scrub with a deck brush, after 3 minutres of so just hose it off.
Simple like that
I used that today - it helped but didn't take care of all of it. Since this was my first attempt to clean it - maybe I just need to reapply.
Now that I know what it is, I think I'll have an easier time figuring out what to use.