Weird stain on Aluminium imac keyboard

[ukchick]

Hi, I have the wireless Aluminium keyboard for my imac.. and i play games on it alot. i've had it maybe 5weeks.. and recently noticed a pink/purple stain on the A and W keys. I've never had anything on my fingers so not sure what it is. Any ideas on how to clean it. I had a "pink" issue on my macbook where the outside edge on the top plate for the keyboard changed to pinky colour.. really weird not sure why...
Would love to know cause and how to remove it please

 

[eawmp1]

With that thread title expect alot of rude comments.

Q-tip with a bit of alcohol on it (damp, not saturated)

 

[ukchick]

lol good point, ah well nvm. cool i will try that