Stained Concrete ... Moss Killer

[DD716TED]

I have several areas of my concrete walkway that was stained (Orange) during the application of a moss killer product... Does anybody know how to remove these ugly orange stains without harming the grass next to the sidewalk?

[HayZee518]

try scrubbing with tri sodium phosphate and water. a weak muriatic acid wash will do it too, but you risk the chance of foliage damage.

[DD716TED]

After trying several things and having to let the concrete dry between attempts.. I REMOVED THE STAINS... I used straight Distilled Vinager and a scrrub brush.. being careful not to get any on the adjacent grass... Once I did about a 3 foot section, I washed the area down thoroughly with a hose.. that way any of the vinager that did get to the grass was very diluted and didn't cause any damage.. Two lessons learned: (1) Be careful when applying a moss treatment and (2) you will smell like a dill pickle after removing rust stains with Vinager..