Mouse Trouble

[Vampyr]

For the past week or so my mouse has been giving me Hell.

It's the left click portion that is screwed up, and it's really beginning to get on my nerves. It's a fairly old mouse (about 3 years), so I'm thinking it may be time to get a new one, but I'm not sure.

The problem is that sometimes when I click it, it doesn't register the click and at all, and I have to click it over and over. Other times when I click it, it registers about a bajillion clicks at once. So if I try to exit out of one FireFox tab, they every single one go kaplooey.

Are there any methods for cleaning and fixing a mouse? I've tried cheese, but that didn't work well. >_>

If it really is a dead mouse, then does anyone have any brands they would recommend to replace it? I would like a cheap yet effective one, and I don't really care if it's wireless or not.