I use the 91% alcohol all the time but will switch to 99% now that I know how to get it. I would like to warn people however about at least one game that alcohol will totally wipe out the sideart with....Spiderman.
I do not know which process they used on the sideart of it, or what other games have that process. But I started cleaning one around the area beneath a leg and it started taking the ink off immediately. Beware and pass this information on to your friends.