Of course the stickiest ingredient in drinks is sugar -- that's why spilled Coke is sticky, but Diet Coke isn't. That being said, the worst spill I ever had involved kool-aid. Spilled it on the top of my computer and it ran down into my desk and through all my drawers. Lost several pictures in a drawer that way; by the time I found them, they were caked together in one big glob. :/