I've read several post about oxalic cleaning red clay from bottom of brick houses. I mixed 8 oz. to gallon of water sprayed on and let dwell for a couple minutes, then scrubbed with brush. I had little to no results. Am I missing something?
I've done only a couple new brick cleaning jobs. I have a friend that wants me to clean his house. The brick has been layed about 4 mos. now.Will the mortar smears still clean up after sitting this long?Also I've noticed some post about eacochems NMB-80 being a good cleaner to use because it is...