For Joan from the Philippines, use Hydrogen Peroxide. Go to any of you drug stores.
If that doesn’t work, get a salt (about 2 tbsp), dump it in a half a cup, containing hot/boiling water. Stir it until the salt melts and water becomes around the degrees of lukewarm to warm. Get a cotton ball and dip it in the mixture. Squeeze it and rub it off the discoloring surface.
Make sure remove your battery before applying any liquid or any form of substance to you MacBook. Goodluck!
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