Originally Posted by
mushroomed
A can of air is a good start and you should try that first, but you made need to use some electronics cleaner on the scroll wheel to really clean out what is stopping it from working. You'll be able to get better access and do a better job cleaning if you take apart the radio.
Yeah, that's what I was thinking. I just don't know if I want to try to take apart the radio - don't want to mess anything up. I have taken apart an MT-S and it went back together fine but the M12 is probably more complicated. I know you can replace all the internals but I don't want to go to that yet. I will just have to be careful and take lots of pictures.