I’ve had my Wireless Mighty Mouse since it came out and it has been great. The rare times the scroll wheel has not worked involved just flipping it upside down and working the wheel over my pant leg and presto, it worked again. Until today.
I hunted a bit around the Internet and found this post about taking the mouse apart. But wait! Before you do that do what I did. Read the comments. #3, when I looked, was by Nu Tron and simply involved using Isopropyl alcohol and a cotton cloth. Worked like a charm. I’m glad I didn’t open the little bugger up. Seems like I often have extra pieces after doing something like that.