Oh ok I know what your talking about we use to use that stuff when I worked for a cleaning company. That stuff is crazy. We had a bottle that leaked a little and it ate thru the wood shelf. There was a new girl that mixed it with bleach one time she almost died. She passed out and I had to drag her out of the bathroom and thru the plant to get her outside they had to evacuate the whole building needless to say they fired her and almost me because I was supposed to be training her.