Isopropyl alcohol does a good job cutting through the oils & fats but it doesn't do a good job with water soluble stuff like sugars & other solids, or dilute acids which is in the Coffee.
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The best thing here is using distilled water (not tap!) so you can remove the water soluble stuff first and try to remove as much of the acids that spilled out. Then wash it down with Isopropyl alcohol (85% or better) as it has a second property as a dryer to help in removing the water we used here or what else is left (oils & fats). Even still I let what I clean air dry in a sunny location for a day letting the IR of the suns rays warm things causing any remaining moisture out.
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The best thing here is using distilled water (not tap!) so you can remove the water soluble stuff first and try to remove as much of the acids that spilled out. Then wash it down with Isopropyl alcohol (85% or better) as it has a second property as a dryer to help in removing the water we used here or what else is left (oils & fats). I let what I clean air dry in a sunny location for a day letting the IR of the suns rays warm things causing any remaining moisture out.
In this case I think you'll need to take your system apart quite far. Review this [guide|7532|IFIXIT Guide - Upper case removal]. This maybe beyond your skill set. Once you get to the top case you still need to disassemble the keyboard. Here you'll find about 80 screws holding it to the case. Then you will need to carefully pull the pieces apart (are you good with jigsaw puzzles).
Of the dozen or so of these I've done I'll warn you its a 50-50% chance of getting the keyboard to work as well as it once did.
Apple only sells as a part the complete upper case, but, I have seen some keyboards starting to show up on eBay that claim to be original. In either case I would just replace the keyboard Vs wasting the time clean it.
As I said this is a big job so you may want to think about letting an independent Apple authorized repair center deal with it (Apple them selves won't fix this it as they don't repair anything that has gotten wet). While it will be costly I still think its worth it (Vs getting a new system).
Isopropyl alcohol does a good job cutting through the oils & fats but it doesn't do a good job with water soluble stuff like sugars & other solids, or dilute acids which is in the Coffee.
The best thing here is using distilled water (not tap!) so you can remove the water soluble stuff first and try to remove as much of the acids that spilled out. Then wash it down with Isopropyl alcohol (85% or better) as it has a second property as a dryer to help in removing the water we used here or what else is left (oils & fats). Even still I let what I clean air dry in a sunny location for a day letting the IR of the suns rays warm things causing any remaining moisture out.
In this case I think you'll need to take your system apart quite far. Review this [guide|7532|IFIXIT Guide - Upper case removal]. This maybe beyond your skill set. Once you get to the top case you still need to disassemble the keyboard. Here you'll find about 80 screws holding it to the case. Then you will need to carefully pull the pieces apart (are you good with jigsaw puzzles).
Of the dozen or so of these I've done I'll warn you its a 50-50% chance of getting the keyboard to work as well as it once did.
Apple only sells as a part the complete upper case, but, I have seen some keyboards starting to show up on eBay that claim to be original. In either case I would just replace the keyboard Vs wasting the time clean it.
As I said this is a big job so you may want to think about letting an independent Apple authorized repair center deal with it (Apple them selves won't fix this it as they don't repair anything that has gotten wet). While it will be costly I still think its worth it (Vs getting a new system).
Good Luck!