I am aware that this is pretty rough and I don't have rock solid evidence that it's superior to other methods, but I'm in the process of collecting evidence and comparisons under a microscope.
I originally got the idea from diamond polishing mx blacks, so I decided to apply that concept to Alps switches. Dust and other debris can get in the switch over time which creates scratches and damages the slider and housing. Polishing paste such as diamond polishing paste is used to buff out scratches in acrylic or other materials, so it should work for Alps as well. Another benefit of using polishing paste would be that the click/tactile leaf surface gets smoothed out, along with the switchplate leaf (although I only recommend putting the leaf on a dummy switchplate, then using that while polishing, as polishing paste may ruin the switchplate contacts).
I used 0.1 micron or 200,000 grit diamond polishing paste I got off of amazon, and hand actuated the switch (more like furiously spamming it) for about 30 minutes on a good condition, but not perfect SKCM Orange. Cleaning the paste off was painful but I managed to get it off with a waterpik and lots of rinsing. In the future I will use a proper ultrasonic cleaner to remove the paste.
Some of the differences I noted were:
- Tactile bump was much smoother
- Overall switch action felt a little smoother
Some things that should improve results:
- Using a break in machine for consistent key presses
- More powerful cleaning to better remove paste residue from the switch