Vinegar!

As a dandruff treatment? Works!

Pinspiration: http://pinterest.com/pin/185210603396419998/

I didn't have a huge dandruff problem, but my scalp would itch and I'd get some flakes. I had a small bottle of apple cider that was close to empty, so I kept it in the shower and used it for 4 or 5 days. I didn't think it was making much of a difference until I stopped using it (once I ran out). Since then, I haven't noticed any flakes. Warning: you may think that you've completely washed out the smell, but any time you sweat or your hair gets wet, there is a definite vinegar smell.

8/27 Edit: Temporarily works. I didn't think it would be a permanent solution. It has been about a month since I stopped doing this and it was a month without a dry scalp! So I'll try again (luckily I have a LOT of vinegar).

8/28 Edit: I used this last night and it seemed to clear it up. Scalp is not dry today!