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Hoping for problem-solving and sincerely,
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Probably because there are pages upon pages of messages on the topic with no real solution.
And yet, I offer another. ;>)
Try this stuff:
http://www.officedepot.com/ddSKU.do?level=SK&id=204057&Ntt=sanford%20expo&unique SearchFlag=true&An=text
If the link is broken, go to
http://www.officedepot.com and do a search for "Sanford Expo". I used it a couple of years back to clean some cigarette smoke stained telephones that electronically were still useful for our new smoke-free offices. The phones were white, but stained to a yucky creamed yellow. Sanford Expo removed it.
If anyone is in the Houston - Conroe - Huntsvillel I-45 coverage area, and you have a stained MacBook, I'd love to meet up with you and see if this cleaner will help. My white MacBook is still stain-free, for some reason. Below is a descriptor from Office Depot:
* Tough but gentle cleanser removes board stains. Tough enough to get rid of shadows, ghostings, stains and permanent ink from dry-erase boards — gentle enough not to harm the board.
* Spray bottle for maximum board coverage. Just squirt some in each area of the board for quick, even distribution of cleaner. Handy palm-sized spray bottle is comfortable to hold.
I would propose doing just a very small area on the stain. Cost is only $3.50 or so for the spray bottle.