https://www.msn.com/en-us/health/wellness/sooo-apple-cider-vinegar-gets-rid-of-dandruff-according-to-dermatologists/ar-BBQV2Ow

Baking soda for dandruff
Mix 2 tablespoons of baking soda with water until you reach the perfect paste consistency.
For best results, part your hair in sections and apply a few drops of olive oil before spreading the paste on your scalp, and let it sit for 5–10 minutes.
Thoroughly rinse the mixture out.

https://www.google.com/amp/s/www.stylecraze.com/articles/get-rid-of-dandruff-using-baking-powder/%3famp=1