What's "fun-tac"?

I googled it for you: https://www.loctiteproducts.com/en/products/fix/general-purp...

It's mounting putty or sticky putty. You moosh it into your airpods and it grabs all the little debris that may be stuck to them.

There's also keyboard cleaning gels made specifically for this purpose: https://nerdtechy.com/best-keyboard-cleaning-gel

Huh, thanks, that does sound quite useful!

This is a good idea! I will look into it.