I use a wireless optical mouse with my PC, and it's been great. I usually use it directly on the desk next to the keyboard. However, the mouse seems less responsive lately. I noticed that the area on the desk where I use the mouse has this discolored blotch now, probably because I gradually wore off the fake wood finish and exposed some of the particle board underneath. Anyway, I'm assuming this is why the mouse seems less responsive lately, so I'm wondering if I should get a mouse pad or something. I know that certain types of surfaces are supposed to be bad for OPTICAL mouses, so what type of thing should I look for (whether it be a mouse pad or just some convenient household item)?