Do you have a link to those videos using contact cleaner? My sister has had issues with the joycons and I already bought a replacement analog stick, but that solution you mention might be easier for her to perform.
EDIT: This is something I might need to do soon, my joycons are already out of warranty, but I noticed one of my right ones the plastic latch is broken again... maybe one of my nephews did it :/
Will have put these metal ones someday
Sure, here's one: