Another thing I found helped (but you have to be careful)...is put a thick (or folded over) piece of (non-glossy) printer paper on top of a t-shirt (or something else of similar softness) and hold the mouse upside down and run gently back and forth on the paper, then move it in zig-zags a couple of times. As I warned above, don't press too hard or the middle "button" might get stuck.