Is the baking soda/vinegar combo really the best?
It's not bad, the Baking Soda is just very basic and you need to balance it out with JUST a tsp of Apple Cider Vinegar (I used to use a couple TBS, not tps, and my progress stopped completely because the weight and conditioning that ACV provides).
I only use bs/acv these days; if I use a regular natural shampoo bar I get all sorts of lumps of dandruff; sometimes I can manage doing 2 bs/acv washes then a shampoo bar wash and repeat. The feeling bs/acv gives me after the wash is just an incredibly clean scalp. I also use tea tree, peppermint, and rosemary (5 drops/10 drops/10 drops respectively).