One more opinion/anecdote.....

On my wife's early-2000's Gary Fisher Tassajara, I went after the balky trigger shifters with a handheld steamer that I already had on hand:

https://www.bissell.com/en-us/produc...izer-4155.html

And WD40. I did about 3-4 cycles of steam/WD (with steam being the final application), then gave the whole thing (on the bike) 24-48 hours to dry out, after which I lubed the internals with Triflow. It's been over a year and so far, so good.

While I have zero doubt that my method falls short of the nuclear option -- the one invoking the freezer and repeated, protracted ultrasonic cleaner cycles -- from that other thread ... it's good enough for me (and my wife) and was pretty darned low effort.