I feel sorry for your Cherries phoenix :/ May it be a warning for the others!
Speaking of warning, I think the worst parts are the legs of the switch.
The corrosion totally destroyed them. As you may know, corrosion is the enemy of solder.
We cannot have the right and solid soldering joints if the corrosion built upon the legs unless we remove the corrosion.
This is a test that I made on a my switch tester.
Even I used high quality solder (the left is Multicore, the right is Kester) plus I need to fill a bigger amount of solder, the formed joints are very weak and ugly.
In short, we should keep Cherry MX switch away from H2O as much as possible.

