High MacHead! U remeber Nr.5 from 'Short Curcuit' ? Thats vott happened to ur ' spill victim'. Usually u turn the victim upside-down, sit it on a towl for ~hours, then put it in a plasticbag filled with a melange of salt an rice & let it rest for at least 3 days. Then u can assume, its nearly dry!
I've treated several 'spill-kills' , none came away without a new topcase 'and' a new mainboard!
In ur case, i'd say:' No backup, no mercy' ! Good luck anyway; let me know when I was wrong.
Cheers Alex