I am a non pressure roof cleaner only, but I do have a question for you guys. I am cleaning the block work around my swimming pool and the decorative block on the walls have efflorescence on them, not to bad, but enough for my wife to notice LOL. I was reading the past forums and saw where someone had used oxalic mixed 8oz to 1 gallon water to remove it. I keep a forty pound bag of oxalic for rust stains on roofs. Will this work and if so what would be good sealer for the block. Equipment is for personal use only a cold water 11 hp honda washer. Thanks for your help!
