Originally Posted by particleman
Did you try and iron/station and solder wick? Some manufactures use solder with a higher melting point than usual. Do you have an adjustable solder tool? Heat guns are mostly used for surface mounted IC and things like that. soldering/de-soldering through holes you are way better off using an iron/station.
^^ This. A heat gun will get warm enough to heat the solder but only really cheap, crappy quality solder would truly melt, let alone melt long enough to do anything with. You'll need an iron, some new solder, and a wick that'll soak up what's currently there if you want to do it right.