Epson Scanner - weird mark on glass? Help?

[mediopollito]

Hi everyone,

I bought an Epson V750 Scanner a few months ago and have been noticing strange rainbow colored marks on the glass. Here's a photo (it's those squiggly lines on her neck):



Is this something that can be fixed/cleaned off? Or is it "in" the glass? Have any of you experienced something similar with an Epson scanner?

Thanks!!