There was a great thread on dry scalp under the "Recipes Forum" that works for me.
Twice a month or as needed I mix:
2-4 Tabs Aspirin (cheap bottle)
1 oz Vodka
1-2 Tabs Alka Seltzer
1 tbsp Cayenne Pepper
I mix it all up, apply to scalp with a toothbrush, leave on for 10min and then rinse! MY SCALP WAS NEVER HAPPIER! It relieves dry scalp, dandruff, and itchiness for up to a month for me. I love it!!!!