Since I already had it in the tub, I gave it another 2 cycles of ditergent and sponge scrubbing. During the first cycle, I used a mixture of liquid laundry detergent and water. On the second cycle, I decided to apply the detergent directly on to the areas that I had the most contact with.
To clean my mouse pads I’ve always used something like Cif Cream and an old toothbrush to get all the residues out of the fibers of the fabric.
Maybe with a bigger but still soft-ish brush you’re gonna get the job done quick after soaking it overnight.
If you try my method I strongly advice you not to go hard with the scrubbing because you might break the glue between the surface and the bottom rubber pad. Also don’t try to squeeze out the residue water like it’s a towel, it’s gonna mess it up for good (ask me how I know that).
You can destroy the coating, destroy the fabric, i do it because before i was a HARD mouse pad user that needs to be replaced, because you legit wear it out (remember those?).
Cleaning with baby shampoo and water legit makes it last forever, i put my cloth mouse pad in the washing machine because i don’t play FPS games seriously anymore, so i dont care that much about the surface being that consistent if i did i would replace it after the second washing, maybe the first one.