Get the smallest soldering iron you can. Put a dab of new solder to get a nice shiny look on the solder. Just DON'T DO WHAT I DID. Make sure you have a desoldering tool, in case you accidentally join to solder joints, if this happens DO NOT POWER IT UP. YOU WILL KILL THE ANALOG BOARD. Get a Desoldering tool and undo the mistake. I destroyed my Classic 2 this way.