also literally douse these areas with 91% IPA,  Flood it,  and get that tooth brush and start brushin.   

goo gets pulled into tough spots causing electrical shorts.



then after you do that, remove the pram battery,  plastic battery holding clip, and ram and vram simms.

put it in the oven about the middle, set temperature and bake it @ 190 degrees F for 15-20 minutes

( non preheat ) that is the key.