Does anyone know what is this green gunk coming out of the mouse

Dirt and grim from your finger. Rubber spinwheels scrape the dirt, oil and sweat from your finger and it collects in the well under the wheel. That shit builds up. Especially if you use those types of mice for long periods of time everyday or if its a communal (shared) mouse. Same gunk builds up on concole controllers (thumb sticks and triggers) and in the seams of your steering wheel

Install gentoo.

>>60177699
that would be black not green. that's the dielectric scrolling medium, which means his bearing is ruptured.

op, it's a grease that generates a static charge as the wheel is turned, which is detected by a capacitive sensor on the board. you might be able to pack it back in, but you are better off buying a replacement mouse or scroll assembly.

Its shreks cum

>>60177277
its sweat. the same shit on your xbox controller