Baking soda cleanses, and it also opens the cuticles (that's great for low-po hair). ACV helps to restore the ph level, conditions the hair, and closes the cuticle (something low-pos don't need help with but we need the other two benefits).

I use this combo as a clarifying wash occasionally. I only recently learned that bs opens the cuticle so last time I decided to do bs/conditioner/ACV/LI. It seemed to work quite nicely.
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.