ill try to dissemble it though, what should I clean it with?
Okay. So you've decided to take it upon yourself, good man. Here are my tips.
Have a clean, clear and 2 year old proof workstation ready.
Have a precision screwdriver kit ready.
Have something that you can keep every screw in, a great cheap item is a discarded egg carton. Put all identical screws in each egg slot and label each slot with a sharpie.
Look online for schematics of your laptop, walkthroughs, anything that can help you figure out where the screws are, where the parts are and whatnot. I recommend ifixit.com though they're the best resource for Apple products and game consoles, they sometimes have good resources for everything else. Their forums will help you greatly as well!
Seeing that your problem is solved when holding down a certain key, I'm thinking you should start by trying to get into the laptop from the top. I had a Dell Inspiron 1520 and in order to get under the keyboard I had to pry some plastic at the top of my keyboard to get in. Be watchful and look for anything that looks like something you're supposed to pry open.
And last of all, I will finally answer your question, (My apologies, I aim to be as helpful as possible.) I recommend cleaning sugary juices with a WARM slightly damp paper towel. SLIGHTLY DAMP, we don't wanna mop the thing. Wipe the dirtied areas clean in a soft, circular motion and then let dry. While you're in the computer, it doesn't hurt to blow it clean with canned air either.
I wish you luck! Water damage is far from the worst thing that can happen to an electronic device so no worries!