Last week I had a customer use oxalic acid to remove iron stains from his brick foundation while my team and I cleaned his deck, house, and roof. When we got around to that side of the house, there was a white film on the brick where he had sprayed the oxalic. Now I’ve cleaned MANY brick with oxalic, and I’d never seen anything like this. I fired up my new 8GPM Pressure Pro and when the brick dried, the film was still there. Returned today and sprayed it with 50% muriatic solution, brushed lightly, and cranked up the PPPW, rinsed, and that’s the last of that nasty effluence.
Has anyone else ever experienced that?
