Anyone had scrolling issues with standard MacPro mouse?

my mouse no longer scrolls down. i either drag the bar down, or use key. once down, i can use scroll-ball on mouse to scroll back up, the only direction that is functional. at one time, only an intermittent issue, but degraded to becoming unusable. any suggestions?

The 4 no microscopic magnetic rollers below the ball are covered in fluff and finger oils.
Even using the recommended cleaning method eventually fails to loosen the fluff because the ONLY way out of the mouse for this build up is by collecting back on the ball then out onto the paper.
Below the ball is a microswitch unit so the debris can not fall into the body space of the mouse.
Finally the bottom of the mouse has been glued shut preventing easy general maintenance.
If you are adventurous you can carry out some surgery to repair the mouse.
You need a scalpel, some super glue, a very small cross bladed screw driver, and a pair tweezers
Right turn the mouse up side down , with the scalpel carefully separate the OUTER grey bezel ring from the mouse top and set aside.
Now press the two side buttons and with your thumb press the front of the top mouse body away from you .
It should click free.
It still may be held by two hinge posts about 25mm/1" from the rear of the mouse so use the screw driver to leverage these free with a snap.
'The body will now be separated however you will now find that the two parts are connected by two ribbon cables.
These are just pressure fitted to the logic board but being careful you shouldn't dislodge them.
So twist the bottom plate through ninety degrees and you will see the microswitch held by three cross head screws.
Unscrew these and set aside.
Now you can finally clean those little magnets using the tweezers.
Now reassemble in reverse and finally using the super glue reattach the bezel.
Allow time to dry and finally plug in USB/Repair if bluetooth and test run what should now be a functioning mouse.

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