comments:
pabloescobyte posted on r/mechanicalkeyboards2w
First clean up that area using IPA (isopropyl alcohol) and wait until dry. Next, add flux to the pins then add solder--yes, add solder. Once dry, use your soldering iron, heat one pin then use a solder sucker to desolder one pin. Repeat the same process for the other. I don't know where you are but using a better quality solder sucker like this Engineer one off Amazon might help. The Engineer solder sucker has a silicon tip so you can put it almost completely over the pin while heating with a soldering iron and depress button to desolder relatively easily.