I seriously am amazed. I got two of these things and I can't stand that it works and I do not know how. My iBook's palm rests = filthy. I'm clean, but the dirt just comes off I guess. In the past, I spent hours using a pencil top eraser erasing the dirty areas and then using iKlear to remove the eraser streaks. Wet Magic Eraser, squeeze dry, wipe twice with no effort, wipe dry with paper towel, ALL GONE. HOW DOES IT WORK? What the heck is in it? It looks like a sponge, smells like NOTHING...I'm stumped... If you're palm rests are dirty, this is the way to go, I'm like in shock... Oh, and then I tried it on my PC's mouse and it took the Logitech logo clean off with one hard wipe.