Thanks fellas!
A sprinkler had spun...2 years ago.
Took me forever because I mixed the oxalic way too weak that morning.
Yeah, I got it off the brick, the driveway and a few other spots around the house.
The end result well worth it you just did what u had to do and I'm sure the customer was pleased with results.
That will more than likely lead to more referal work for you once again great work.