Sour water and sour milk are against dandruff.

In oily,dry dandruff wash head as every week of sour water as one tbl.sp. of vinegar ads in one l. of water,and care massage a skin of the head after. Grease skin of head a sour milk mixed in chopped garlic, as wearing for hour a towel, wash head of nettle shampoo,rinse of chamomile, burdock, or birch leaves infusion, and leave for dry on all evening.
As old recipe of one tbl.sp. onion juice, two tbl.sp. of wine, rub in head before wash, as after mix one tbl.sp. of nettle or two tbl.sp. of birch leaves in glass of hot water, infuse half hours, rub in head after washing for 4 months. Or one tbl./sp. of castor oil or burdock, 10 tbl.sp. of calendula tincture, and rub for three times/day .