Tarot I read once
by Mysti
that you can dampen a cloth in some lukewarm, soapy water and wipe each card and allow it to dry
That is supposed to give them a bit of "tooth" to make them easier to shuffle
I haven't tried it other than to clean a very old deck
That one did not have the plastic coating that newer decks have, so I don't know if it really helps or not
I do know I had to place the individual cards between layers of waxed paper and put heavy books atop them and let them sit until they were completely dry
That took about a week
I wouldn't think plastic coated cards would be affected that way
I can't guarantee the outcome, so take it with a grain of salt, ok?
other posts in this tarot thread
New slippery cards!! by retzel
by Celeste
I read once