I would be very interested to hear the answer to this as well. I'm flying to the US on Saturday, and I figured I had thought of all the items I would have to put in my checked luggage. I typically carry a couple of wet wipes to get the ink of my fingers after reading the newspaper during the beginning of the flight, as well as a few wipes intended for monitor cleaning that I use to clean my laptop. I never thought that those might be considered too dangerous to bring on a flight.