ALLSOP26226 Wrist Rest Blue

Suggestions for cleaning? I've happily owned this for over a year, but the blue is starting to discolor from skin oils, etc. Not very attractive...

Is this available in any other colours?

Am I supposed to remove the plastic covering from the bottom (presumably to secure the pad in one place)?

Could someone measure the height at the high end, low end, then the horizontal distance across? Would like to rig up test before ordering.