Macbook Pro 15" mid 2010 had pop spill on keyboard, would not power up.
Apple wanted $1240.00 to fix the unit without even knowing what was wrong. I found ifixit and ordered the tools to diagnose the unit. As I took the unit apart the spill was confined to the keyboard and power button. This meant a new upper case, everything else looked fine. There was residue on the antenna ribbon and a dot on the edge of the logic board, not near any electronics.
The upper case came very fast and was an exact replacement. The ifixit guide was very good. I followed it step by step. Used water to clean just the two dots of residue. I cleaned, dusted off, everything else and put it back together in reverse order of the guide. The unit powered up fine, I put a full charge on it and did a full hardware test. No problems were found. The only problem I had with the tool kit is I got two T5 bits and no T6 bit. Check your kit before you need it. I had a T6 from a hard drive replacement and used that. As this was the first time I used ifixit I did not take pictures. Next time I will.
I have read most of the ifixit guides for this Macbook Pro. I believe this to be the best way to diagnose and fix a problem I have come across. I will continue to use ifixit for anything I need to "fix" that they have reference to. I encourage anyone to do the same. However, for this "shared" repair experience to continue you must submit your experience, including pictures and problems. Pictures say a 1000 words and your problems could prevent others repeating that problem. I will always take pictures in the future and always respond with them.