In article ,
"William Sommerwerck" wrote:

Any desoldering method sometimes needs a bit of fresh solder to
"loosen things up" so the solder can be sucked out of the hole.

Nuts. It doesn't need fresh solder, it needs fresh flux. The fresh
solder contains the flux, but it also contains a healthy dose of what
you're trying to remove. Much better to just add a drop of flux.