You probably have some computer mice which won't work properly after using it for a long time. There are optical mice and old style mice with balls beneath. The repair processes of a mouse includes: cleaning the dust inside it, if it has been used for quite a long time. If this won't work, then what you can do to repair it, would be resoldering it.
An old mouse will have sticky dust on it. Every time you use a mouse, you are in fact luring dust inside it. If it's a mouse with ball, just clean the roller and mostly your mouse will work again. If it's an optical mouse, do the same cleaning.
Soldering a mouse is sometimes needed when a mouse is not working properly after cleaning. All you have to do about it is removing the tin of the solder and resoldering it. Hopefully, it may work again.
