ball mouse not moving correctly anymore

If you have one of those old mice with a ball at the bottom instead of the newer optical ones(the ones with the red light at the bottom), you may notice the pointer doesn´t move so well anymore when you move it.
One big way to fix this is to turn the mouse upside down and remove the protection lock that holds the ball in place by turning it anti-clockwise.
Remove the ball and clean the three small scrolling wheels that are inside with a cotonete and some alcohol(not the drinking kind ) untill the excess dirt is gone.
Put back the ball and close the lid ,it should work now like new.