Mouse issues on an iMac

I hope this is the correct forum. I didn't see mouse under the hardware area. I have iMac 2.8Ghz. I originally installed the blue tooth mighty mouse. After about 2 months usage, I lost the ability to scroll either direction (only down, no up). I check preferences and the scroll either direction option is checked.
I plugged in the USB mouse that came with the computer and it is a bit wild. It seems to have a mind of it's own and jumps around the screen occasionally.
1. Does anyone have any suggestions on what might be wrong with the mighty mouse and fixes?
2. Does anyone have any suggestions on what is happening with the USB mouse.
Being a recent convert from Windows, my knowledge base defaults to what the problem might be (drivers usually on Windows), but I'm not sure where to start on the Mac.
Thanks.
Sam

Thanks for quick response. For clarity, the whole system is just about 2 months old. Not sure how dirty it can get in that short time.
Question: Use the same lint free cloth like using on lens?
Not on a shiny surface. Was using on a black mouse pad. Now I'm only using the surface of the desk. Med brown color, like a med walnut in color.

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Check out the Community Knowledge Base for hints and tips.
Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"!
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Message was edited by: Blurr_designs

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