Norminn wrote:
wrote:
Rough texture sidewalk and slab outside of garage in GA/SC area have
DARK appearance. Mold is suspect but moving here only a year ago
doesn't provide much if any corporate memory. Similar appearance on
steps down to the pool and around block wall 'tween pool and flower
bed. Remediation steps would be great! Expect bleach solution for
correction but concentration needed. Additionally is abrasion with
brush needed when whatever solution is applied?
1:10 bleach:water is plenty strong - I haven't bothered with sidewalks,
only stucco walls. Took off a lot of paint chalk as well. Be sure you
don't get it on metal (exterior hardware, car, window frames, etc.). I
used a brush, but a hose-end sprayer probably would work fine on flat
surfaces. Do it when the sun won't dry it out right away. Rinse well.
If in doubt about delicate plants, avoid them. Didn't hurt mine.
Power washer is the easiest and fastest removal and will take it right
off. I wouldn't screw around with a brush, etc for a sizable area.
I'd use one of the detergent solutions made for power washers, availabe
at the home center stores in paint dept. You could add bleach, but I
don't thick it's necessary or will make any difference in getting it
clean. The power washer will remove what's there and any
bleach/detergent, etc is going to be washed away. Maybe finishing
with a rinse of bleach solution might assist in preventing it from
coming back for awhile.