This other video has audio commentary (Portuguese) http://www.youtube.com/watch?v=_JCClsqA5NA

This is a five minute video I just made while repairing a PS3 mainboard with no-clean flux and a heat gun.

The whole process relies on applying the flux into the chip's bga balls, so that all cruft can be dissolved and then more heat to attempt an actual reflow process to occour.