== Cleaning may help ==
''' The tea that was left behind has crystalized or turned sticky''' and that's what's causing the problem. ''However, using the machine while there was still moisture under the glass you could have shorted out that contact''
[http://www.PowerBookmedic.com/MacBook-Pro-15-Unibody-Trackpad-p-17445.html|Depending upon the model] of your MBP you may be able to remove/replace the track pad only, otherwise its the entire topcase.
'''If this answer is acceptable please return and mark it.'''
Good Luck,
N.