Recommended
Weller How to use a Soldering Tip Activator - Application Video
Why people recommend it
Shows how a soldering iron tip activator is used to restore an oxidised tip, linked when brass wool and a sponge are no longer enough.
Watch for: for badly oxidised tips, not everyday cleaning
In their words
Basically a little box with some cleaning chemicals, sold by Weller among others - check this video.
Lundin on electronics.stackexchange.com, Apr 2021. CC BY-SA.
Here is a nice video: [video] It really works.
Oleksandr R. on electronics.stackexchange.com, Jul 2015. CC BY-SA.
