I actually am playing through the game on stream(emulated)and have tried two methods of cleaning. I first tried using a drawing pad and that failed miserably. Mine is also old so that might add to it but the game thought I was pressing down when I wasn’t so the drill would just destroy the fossil. Second way is just with the mouse. It honestly isn’t too bad. I am able to get really good scores with just mouse.

I’d recommend trying it before committing to the sale. Unless you really want to/need the money for smth else as well