Neodymium wrote:
But I just noticed doing an image search, they do one with a needle dispenser, which may be more available in the Europe and the US

I use DeOxit all of the time in my vintage audio restoration stuff. To be clear - DeOxit D5 is 5% concentration of their patented contact cleaner. The other 95% is a lubricant and a carrier cleaner that evaporates quickly.
DeOxit D100 is literally a 100% concentration of their patented contact cleaner. There's no lubricant.
You use D5 when you need to spray it into potentiometers and other hard to reach places, or need to lubricate the oxidized surface as well. You use D100 when you have direct access to the metal you need to remove oxidation from but don't really need it to be lubed. Fun fact: DeOxit F-series is made for faders that use conductive graphite. Don't use D5 or D100 on faders!
Glad to hear you got your Q-links working. They're just bog standard potentiometers (with capacitive touch added) at the end of the day, but I don't know if they're sealed as well as they could be. Clearly since yours oxidized so quick they probably aren't! LOL!