All of these chemicals should be BANNED!!!!!!!!!!!
I once cut into a waste pipe after asking if they put anything down the drain they said no. I got the water all over my hand as you do and it started burning like mad. I knew straight away what it was and went mad at the person saying what have you put down it! they then confessed they had used something (If I can remember correctly it was oneshot but I could be wrong) I pulled my tray from underneath the still draining pipe and walked off swearing at them. Later on I got called in by my boss who had received a complaint when I explained he said did you hit them? I said no but I wanted to he said I would of and then sent the bill out and also said if it injured me then he would recommend suing them.
I think I was lucky as it must of only been a very small amount went over my hand although they had put loads down (a bottle full).