Stained IMAC

So I have a 20" C2D, and i just noticed that on the bottom left corner there's a bit of a "stain". I use the term stain loosely because it's more like the outer plastic is now "frosted" i guess...like some sort of chemical splashed on it. It's only visible when the light hits it at the correct angle, but now i know it's there, and it's bugging the bejeezus out of me.

Has anyone had any luck with any sort of polishing methods on the outer plastic?

Was it there when you bought it?

If so I'd try returning it if it doesn't come off.

nah, didn't notice it until last night, i dunno who spilled what, but i know it's a new blemish