I wrote this piece of drivel last year: Healthy Scalp Trick
Don’t do it. Or if you do, be very careful about it because vinegar is acidic and will throw your scalp off balance. I got major uncontrollable dander after doing it. So I did it some more. And it got worse and worse until I realized maybe it was the vinegar making things worse. Indeed, after washing my hair with nothing but a ton of conditioner did the scalp finally calm down. I basically was burning my hair with vinegar and turning it into a big mess.
If you still choose to try it, dilute it heavily and don’t leave it on your head very long and try to just do it on your hair and avoid it getting on your scalp (which is very hard).