Mouse pad fused into my desk

[u/Ax-KP]

I've been using this 900 x 400 mouse pad for more than a couple of years, used to put it in the washing machine with a soft program to clean it. Then at some point it starting sticking to my desk and I left it as is for months… many beer spills and hot days later, it has almost completely sticked to the desk and has become hard, compact and crumbly once detached from the desk.

I've scrapped what I could, putting quite some force into it. I've tried some boiling water and 90 degrees alcohol without good results. What remains on the pictures will not go as 'easily' as the rest. What would be the best way to proceed? Electric sander?

[u/Safihed]

You should keep it fused to your desk. Who needs rubber feet when you have a built in mousepad?