Corrosion or flaking of Magic Mouse's aluminum finish.

After several months of use, I've noticed that the aluminum finish on my Magic Mouse (near to where my thumb and ring finger rest) seems to be flaking off or otherwise corroding somehow.

It's not a stain, as nothing I've tried will remove it.

I also noticed some slight corrosion or flaking on the topmost line of the edge (the sharper edge) of the mouse where the aluminum housing meets top of the mouse. The damage is on both sides of the mouse in either case.

Needless to say, I'm quite displeased. I take very good care of all my Apple hardware, I keep them spotless. My hands are usually clean - just as clean as any other user's hand. I assume the Magic Mouse's finish would be durable enough to withstand regular use.

I wonder whether this as happened to anyone else.

Pics below:

http://img706.imageshack.us/gal.php?g=img2120b.jpg

Thanks for your time.