>>648198004nah man, i had it waaaay worse.
do a time machine backup, switch your mac off and then flip it,
take out all the keys that are affected.
Give it a rough clean with a moist sponge.
Clean all the nasty shit out with qtips.
Lastly finish it with isopropyl alcohol (the one that doesnt disslove the plastic of the keys).
Reassemble.
