sounds funny,I may try it! Haha, my way is to just leave it to dry for weeks.
Btw, soda and water are different for cleaning since soda has sugar making keys stuck. U do need to wash it directly before drying it. It is weird: wash it to save it from spilling. But for drinks, u really do that:)
Another thing to note, if your trying to wash out anything thats not water (and thus likely to leave something behind when it dries), its best to use the purest alcohol (99% Isopropyl Alcohol for example) or purest water (Distilled Water) you can get. Neither pure alcohol or pure water is damaging for electronics (in the short term, in the long term pure water is slightly corrosive and it has the tendency to become impure pretty quickly).
Bah.. You don't "need" distilled water.. You don't even need deionized water. Just use water or alcohol, it makes little to no difference what grade.
This is NOT biochem, exotic purification is NOT NECESSARY
![Smiley :)](https://cdn.geekhack.org/Smileys/solosmileys/smiley.gif)
), If you take a close look at most pcbs in keyboards, You'll notice that they usually don't even clean it that well. Why? because it is "unlikely" to affect its performance.
The reason I recommended taking the keyboard apart was because we don't know how well you cleaned your cup prior to drinking water, and there's also saliva and perhaps sugar left in there.
That stuff probably won't affect the electrical, but could make the keys feel sticky and unsmooth, hence the cleaning.