I accidentally pour a little juice on my MacBook (MC700) but it was still working fine. I immediately switched it off and put it upside down to get the juice out. After several hours I tried and it worke still fine. However, two days after that I found my MacBook couldn't be charged . The light was dim green but MacBook could still be switched on. I followed the answer found on the Internet. I used a toothbrush with a little alcohol to clean the charging part. Surprisingly it could be charged again, but one week after that it suddenly could not be charged again... I tried the same method but it didn't work out... What should I do?