Logitech G604

I really like this Logitech G604, but recently it started having this problem where the scroll-wheel wouldn't actually move anything on the screen. It would spin but only intermittently scroll.

The orientation in which it won't scroll

Pitching it down or up gets the scroll to work

If I held the mouse in the air and pitched it down or up, it would scroll! I figured it must be that there's something caught in the scroll wheel. I didn't actually manage to solve the problem but blowing air using an electric air blower did the trick and the mouse scrolls properly now.

The scroll wheel will click left and right (i.e. you can push it to the right or left) and you can use that to get some extra space to blow some air. Compressed air will probably work just as well as an electric air blower.