I try to make individual blog posts for each experiment and successful remedy that I try, so I wanted to make a brief post about this. I have been dealing with scalp dandruff on and off for a long time. I don't know whether or not it's related to my seborrheic dermatitis, but I suspect it might be. Recently, for the past several months, my dandruff has been particularly stubborn and hasn't responded to my Head and Shoulders shampoos. As an experiment, I tried going two weeks without shampoo, which only made the flaking worse.
A few days ago I decided to try the coal tar shampoo that I had been using on my face (unsuccessfully), and after two or three days my dandruff almost completely disappeared. So the coal tar shampoo worked where two different types of Head and Shoulders shampoos failed. For reference, I just used a generic store brand shampoo.