OK, a little report for anyone who finds this thread in the future:
I used JoMax on the camp deck--was $5 for a gallon of ready-to-use, and it worked great. I did have to scrub a bit, but it wiped out all the mold/mildew and cleaned up real nice. It does smell a bit like bleach, though, so washing it off after is good.
I also tried Wet & Forget on two roof tops. It killed all the moss in a few days, but the moss hasn't yet "washed off." I don't think it's a huge deal, but if it doesn't wash off in a few weeks or so (as instructions suggest), I will just have to get up there and brush it off. It's definitely dead, though.
Now to do my home vinyl siding and deck!
Thanks for the suggestions, all.
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