Lightly mist with an acid rinse, rake it( or other form of agitation) to get rid of the wand marks you left from original cleaning and extract. When cleaning berber, lower pressure is recommended(300-350) psi and lot of dry passes to avoid browning.
Stuff is trash. It ruins carpet. It ruins pad. And it destroys the vacuum's. And they are paying for it to do all of this. Hate that crap. No vacuum is powerful enough to get that fine dust back out of the carpet. It migrates all the way through to the subfloor. And smells like dirty laundry. Did i mention the stuff is trash lol.
You Dont Tug On Superman's Cape.I would rake, vacuum really good and then bonnet clean that one with an o2 booster. I've seen similar situations when they used carpet fresh powder all the time after they vacuumed.