a) Rubbing alcohol already puts you behind the curve. Use 99% or don't bother. Search eBay. I like ultrasonic cleaners like the ones for jewelry, howeverm if you are patient, 99% alcohol works great, with a fresh, hard toothbrush. Do not brush back and forth, brush from the center of a particular location outwards.
b) Stop plugging it in. Each time you do you potentially screw up something else.
c) Do not just clean. It is not the cleaning that is important, but rather, the drying. You can keep the board next to the window or let it dry for weeks and it can still be screwed up. However, half an hour next to a drying tool that does not apply heat to the board will get the job done. It was once I realized this that I had a 100% success rate on the water damage stuff.
If you do not have access to professional tools for part C, a household dehumidifier will work in a pinch. After you're done going through the board with a fine but strong brush & 99% alcohol, hang the board in front of the dehumidifier's intake. Change the side facing the intake once an hour. Do this for about six hours. If you feel the air moving into the dehumidifier from outside the dehumidifier - if you can drop a paper in front of it and watch it get sucked onto the dehumidifier, it will most likely work.
Do the drying right after you have done the brushing, with the board still a bit damp from the alcohol.
Each step is important, the more you deviate from this the lesser the chance it'll work again.
Lastly, let this be a lesson that buying broken under the impression of fixing it and having a cheap macbook is a bad, bad idea!
