I was just reading up on mouse pads a bit and i notice that alot of ppl say its not necessary to have a speical or nice mouse pad, just any cheap regular pad works. But I noticed that alot of these cheap mouse pads i have have this black gunk on it over time, and I hate it. Was wondering what kinda pads don't have this or have less of this. I saw that overhead transparencies are good, anyone try that before? perhaps a fabric type mouse pad?