Many years ago I was living in a place with about 95 to 98 percent humidity and everything was rusting or molding driving me crazy.
Lost a lot of electronics and machines and it still distresses me.
But had a mixer that I just opened up and sprayed with some W-40 and it started to work and after this have always sprayed everything inside when things gets phucked up.
Anyway the last night with about a hundred USB sticks that kind of works but not really and needing to put a film for my lovely daughter so she that she could see it on the TV.
Decided to try with some W 40 (electronic connection spray) and put the small straw unto the bottle to spray it into the USB stick...
It did work really well and this would probably work with any USB connectors/receptors of any mobile and computer etc too.
I did consider to try to clean it with some thin stick or similar but this was definitively easier!
There is other brands of course than W 40 and I am not endorsing their brand and I am sure that any kind of other similar spray works as well.
This post is of course not directed to any readers that actually live in the real world of technical or left side braininess but to people that have a hard time to connect left to right like me.