Place a copper strip or some wire or some copper nails so that the overspray
washes over the copper before splashing on the brick. The copper ions will
kill the algae in a few days to weeks and it won't come back. Might as well
start off with bleach.


"m Ransley" wrote in message
...
Mold will come right back , powerwashing can ruin mortar, bleach kills
mold, cheap and easy.