Hey Mike..I just replied to you on another thread that I posted about Potassium Hydroxide and I am in Hillsdale, MI just S of Jackson. Maybe I could get your PH.# and we could chat sometime?! I was hired on by another p-washer on a previous industrial paint prep job and he used hydro on that building. That to was cement painted block. I no I can prep this one myself so I don't want to get another washer in on the cut! So any direction on chemicals that you have would be greatly appreciated....THANX