You don't need "extra" flux, or anything special to clean the pads on your pcb.
Just re-apply the soldering iron to the pins, and the solder beads and bridges
should all disappear. You can essentially wipe away the bridges using the
soldering iron tip.
The only real trick to good solder joints is:
(a) to have the soldering iron hot enough in the first place to melt the solder in
a second or two [but not too hot],
(b) to heat up the pins "before" applying the solder, and
(c) to not apply too much solder.
Getting beads and bridges implies too much solder or the joints not being hot
enough for the solder to flow.