As you are going to replace the mouse - financial authority granted - you can try washing and drying it.
If is doesn't work nothing lost. If it does then a couple of Buds could be bought instead
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PS
Years ago I had a rather expensive keyboard but it suffered from sticky keys and uncommanded inputs - after I had poured coffee over it.
I photocopied the keyboard, turned it over and undid the case.
I removed the ribbon connector and the keyboard membrane.
I put the keyboard and case under running water and then dried them near a radiator. You should have seen the biscuit crumbs let alone the coffee.
Then I peeled the 4 plastic membranes apart and washed and dried them. Once dry I carefully realigned them and reassembled the keyboard. It lasted long enough for me to save up for a replacement.
One day, on spec, I dropped into a small hardware store to see what the damage would be. $15 got me a new keyboard - cheap as chips and not worth shopping around.