Sealed mouse
My laser mouse was behaving in an erratic way this morning so I dismantled it and - yerch ! Full of fluff, hair, grease, and...well you get the picture. So much it had gotton into the left hand click switch and as for the scroll wheel it looked like it had been off-road. Shake out, spray with contact cleaner, hairs pulled off with tweezers, dry on cloth etc.
Now I know they are very cheap and when it doesn't work, you just buy another one, but seems a waste to me and if they were designed to resist penetration of gunk they'd last longer.
Has anyone had a satisfactory long-life mouse under their fingers ?