Just want to share my story, since this is the first time I lubed a keyboard. I'm still pretty new to the mechanical keyboard world and I've only had my HHKB (dental band modded) for a few months. Used to own a DAS Pro 4 MX blues.
This is how my HHKB spacebar used to sound:
https://drive.google.com/open?id=0B24lbkpxqzHaa3JHbnlnRmRrMXc A very annoying rattling sound. Especially on the right side.
It was horrible and it completely ruined the experience for me. I had tried reseating the spacebar in different ways, dissassembled the board to try and find out where the sound was coming from, but I was unable to figure it out. At one point I was about to just accept that my HHKB would now sound like this forever, but I couldn't let it go. So after some more research I found that perhaps lube would solve the issue. I bought some CRC Di-Electric grease.
I just took it apart and applied some lube to the stabilizer wire and clips and this is what it sounds like now:
https://drive.google.com/open?id=0B24lbkpxqzHaVmZrWUticm5BY2c It sounds amazing again. I'm back into "Thock Heaven".