Recently got similar questions as well. Why do you want to wash it? Won't wiping it with an appropriate solution be better?

Meaning that your mousepad is very dusty and the dust sticks to your mousepad? Then when you glide your mouse, the dust sticks to your mouse skates?

you can actually send your mousepad for a wash in 1 of those dobi shops. i had a friend who did his.
the uncle didnt know how to charge him so it only cost him about rm4 if i can rmb correctly. it came out
looking brand new. hope this piece of info helps

use air gun and shoot until the dust come out
high pressure air gun. hehe

my 7g keys some press d when release it too suddenly then fly out.. hahaa... then when at the peak of the game this happens, really no time attach it back d.. haha.. but so far my Tab ans Caps button will pop up..