Our pressure washing tech also recommended CLR to remove the stains caused by the irrigation sprinklers. I mixed about 2 oz CLR (its highly concentrated) to less than a 1/2 gallon of water. Sprayed the stained area with water, used a scrub brush with the CLR solution and rinsed the area. Repeated where it was heavily stained.
Adjusted the affected sprinkler heads to prevent further staining.
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