i have some questions my macbook is almost 6 months old and inevitablily dust, human rests, dirt has acumulated under the keys, i clean PC keyboard some periodically taking away all keys and cleaning them but i cant figure out how to remove dirt from this macbook keyboard, is it even possible or i have to take it to an apple store? my second question, i think i have discoloration issue because the palmrest has a stain which i cant remove and it looks dirty even when it isnt, i dont have apple care, will they replace it? third, the trackpad is becoming more and more shiny, is it replaced when they replace case because of discoloration? finally, the DC adapter sometimes emits a buzzing sound is it normal? it has a fan or something?