Put it in the dishwasher, please. And then throw away both.
I'm pissed at my mouse.
It drifts, so if I start to scroll and pause for a second to re-read something on a page, I often move my taskbar to the side, a semi-useless Windows feature to me. It happened once when my wife was reading and she freaked out, thinking she had "broken" the computer.
I've cleaned it and the pad, replaced the pad with a different color (it's an optical mouse), tried it without a pad, re-installed the firmware ... still the fucking cursor drifts to the side.