Leopold keyboards are *not* hotswappable, so I do not recommend trying to remove any switches. Nor do I recommend trying to open switches.
You can remove the keycaps and try to ventilate your keyboard as you might do with a mobile phone that has been exposed to water.
However, if those switches don't come back to life, I wonder if it is the switches or the PCB that are damaged. If it is the PCB damaged, you are in big trouble, that keyboard is basically dead.
However, if the PCB is still working, then hypothetically new switches could be soldered onto the PCB. It is a big project to desolder the switches and put in new ones, but at least you would be able to keep the keyboard that way. If the PCB is dead, the only thing salvageable from your Leopold are the keycaps and power cable.