"Phil Allison"

What the other say is true but I wanted to add, those pictures of the
'good' soldering job is substandard soldering. After cleaning off the
old solder with a solder sucker and/or wick, the old flux should be
removed and again after the new soldering.

** What for ?

Solder flux is normally harmless and routinely left behind by many
manufacturers.


Not the good ones.

** Circular argument.

Solder flux IS routinely left behind by many major manufacturers ( both
now and for decades into the past) and clearly does no harm.


So, it's OK to be a slob just because you can?


** Seems to be the way you go about YOUR thinking.

**** off - imbecile.