Liquid Damage Partially working keyboard

Hey guys though i've already searched for topics involving liquid damages i was not able to find a case that was pretty relevant to mine so i'd like to have some of ur advice on this question :

So basically i own a Mid 2009 Model A1278 / 2.26 GHz and my keyboard doesn't work properly. Seems like 2 upper lines of keys are linked . Like when i type q the result is q1 , w is w2 , e is e3, r is r4 and so going on for the first range of characters... It's very annoying and this issue came after i've by misfortune spilled some glass cleaning liquid on my keyboard when i was cleaning the screen.

Before opening the whole uppercase and applying the step-by-step guide i would like to know what could be the problem and how eventually could i solve it. Replacing the whole part doesn't sounds pretty fun but i'll make what it takes to make it work properly.....

I've already let the whole thing dry for about 1 week now and still no changes. If there's some quick fixes let me know :)