like jhill said!!!! If you have any doubts, go with ivory liquid (my choice over baby shampoo) and water.
Why even consider anything with alcohol?????
edit: I just read your last thread. I see where some have soaked the protective
paper (it was old) in alcohol, where you just wiped it down. It dosen't seem like your getting consistent answers.......so again, don't take any chances. Wash it down with a few drops of soap and water (and if you want to apply wet) for this project, and don't worry about it.
I know you have a bunch of this
sign material from the last job....... so do your own test with the rapid tac for future reference.