Yes – the capacitive PCB is completely sealed, though the keyboard is not waterproof. There are no metal contact pads exposed on the capacitive PCB (the large PCB underneath the keys). You could disassemble and clean the keyboard with a mechanical key removal tool and a flat head and phillips head screwdrivers – no special screwdrivers needed!
At the suggestion of some people on the Geekhack/Deskthority forums I now offer a “first aid kit” in case you spill a sticky drink and would prefer to replace the sticky parts instead of trying to clean them:
https://www.modelfkeyboards.com/product/f62-f77-first-aid-repair-kit/
You can add a first aid kit at no extra shipping charge to your existing early bird or final round order if you’d like.