Yes they do. I have a blue pad and don't know what grit(?) so before I possibly made another poor decision I went back, used my wax remover, washed with hot water and soap and applied the previously used cleaner/polisher, hand rub on, wax. This time I rubbed on by hand and machine buffed off but eventually my pad took on too much polish and I had to finish all by hand.
I took it out in the sun and voila (?) 98% of graffitti (?) was gone!
Thanks for your advise. I will try to find out how, first, next time. Dogs have come back home again!