Possible water damage?

Okay so I was enjoying some youtube videos, and eating cheese raviolis, and well, i ended up dripping butter (like melted butter) on my screen, so i just...wiped it off, and continued watching my videos, but then I noticed the screen acting weird, and now its got a small white water damage..cloud spot thing in the corner where it dripped, and everything is very pixelated

I would add a picture but Im using it to post this, and a screenshot wouldnt exactly work lol

but please help. Its the mid 2009 MBA we just bought it used, and I literally got it 4 days ago. like the edges of every color have like a super pixelated border, almost like someone put one of those edge finding color filters over a picture, if you know what Im taking about ^^; Please help I cant afford to get it fixed, or even a new screen to do it myself so please, is there anything I can do?