Exactly - it removed the build up. Although that was a strong concentration - much higher than what it typically would be for a hair solution.

As far as using it all of the time and as the cleanser - I'm not sure about how the acidity of it might mess with the ph balance of your scalp, if at all. That being said, I have read of people doing this very thing and they are quite happy with the results.

I use ACV on occasion but as a rinse after a bs wash. (And yes, white vinegar can be used instead, but the ACV has antibacterial and anti fungal properties I don't think the other type has.)
remember, with all advice or suggestions for your hair, YMMV!!
My hair:
2b wavy, medium texture, low porosity, med-high density. Protein finicky.
My routine:
Cleansing: DCNP, every 4-5 days (occasionally use CJ cleansers).
RO: CJSC, occasionally use JCDC
Gel: KCCC, CJCIAB for 2nd day hair (sometimes third)

Heat is my friend: warm water rinses, steam caps, and diffuse dry. I love CLU cloths and my Denman.