I suppose it should not come as a surprise that there even worse switches!
When I first opened up a mouse I made the mistake of thinking that the Omron switch was completely sealed. I could not see any seems! So, my last experience with Logitech mice was to make one working one out of two faulty ones, but I am lousy at electronic soldering (yes: practice would make perfect!) and, although it worked, it was a mess. At least I had spare switches to practice on when I found they could be opened.
Sure, I do not expect DeOxit to have been a permanent cure. Whatever oxide, muck, etc, gathered there before, it is sure to do so again. I just expect to be able to repeat the treatment as and when needed. Next time, hopefully I'll have some DeOxit S or Gold for longer-term protection. Maybe, one day, I might even be the proud owner of a tiny bottle of Stabilant!
Now. "Tact Switches..." Tactile, I suppose, the miniature-button type switches...
Cannot easily be taken apart. No, that's wrong: I did (On a dead mouse: just cut the four plastic "rivets"), and they can... Cannot easily be reassembled! Do I just spray in the DeOxit, shake it about, press the switch a hundred times and then turn it upside down and let it drain?