Intel BGA flux type?

http://intelpr.feedroom.com/?fr_story=236a12fb4342ce6a578b40e8b7121d14c0bab751

Watching this video, i was wondering which type of flux they use for cleaning and for reattachment. I was unable to find the flux they use.

Shown at 4:17 4:29 8:59 If unknown, which flux do you use for cleaning?

I currently use MG Chemicals 8341-10ML for cleaning and attaching reattachment. Works, but leaves residue.

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