Mighty Mouse Scrolls Vertically in one position (down) only

I've been using my wireless mighty mouse for about 1 year and it worked fine. recently, I lost the ability to scroll vertically down.
Has anyone had that problem and/or has any idea on how to fix it.
I would certainly appreciate any help.
Thanks.

Neil,
Thank you very much. Because the dirt was not visible and I thought I had kept my equipment clean, I never expected that dirt would have been my problem. However, it was.
Thanks again, I really appreciate this.

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    Usually it is accumulated crud: skin oils and flakes of skin and dirt, but some have been accepted for repair by Apple. Occasionally a restart fixes the problem. If not there was a recent discussion that yielded several promising suggestions:
    http://discussions.apple.com/message.jspa?messageID=2248877#2248877
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  • Resetting bluetooth may fix your mighty mouse scroll button

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    Message was edited by: Barry Hemphill

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    Second.. How to clean a Mighty Mouse (not with jeans)
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    Message was edited by: Carolyn Samit

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    Isopropyl alcohol.  Preferably 95% but I've done this with the typical 70%, so whatever you have in your medicine cabinet.  With Mouse unplugged (powered off, battery removed for wireless mice,) put the mouse on a paper towel and pour a small amount of alcohol over the ball.  What you are trying to do is get some alcohol down past the ball and into the internal rollers, which have some gunk on them that you're trying to remove.  Isopropyl alcohol will not corrode the electronics and will help loosen and break up the gunk.  Roll the ball and pour a little more.  Repeat a few times.  You will want to let everything dry as much as possible before using.  Thus pouring a small amount and not the whole bottle and not "dunking" the mouse in a bowl filled with isopropyl alcohol.  Do that only if you get really desperate, but if you do, then let it drip and air dry afterward.
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  • Mighty Mouse scrolls up, but not down

    All of a sudden my Mighty Mouse stopped scrolling down. Is this something that a cleaning might help, or something more serious?

    MGW wrote:
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    Nick

    DP, that is what worked best for me in the past.
    After months of problems with the scrolling ball, and after trying all the suggestions found on the web, this method of using a white sheet of paper was an excellent one: my MM was again clean and working as if it was new!
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  • Mighty Mouse scroll disables Catch

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  • Mighty Mouse, Scroll Ball Still Malfunctioning?

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