Shortly after we were married, my husband developed an awful case of seborrheic dermatitis, and even the prescription shampoos did little to abate the mess. His scalp was oily, smelly and the flakes came off in huge greasy patches. I remembered having something similar as a child and my grandmother using apple cider vinegar directly on my scalp and thoroughly coming off as much of the scaling as she could. She then took a bar of coal tar soap, scrubbed my scalp and hair and then took a huge glop of mayonnaise, worked it into my hair and covered it with a hot towel. After about 30 minutes, she rinsed out all the mayonnaise and let my hair air dry. She did this three times in total over the span of a month and I had no more flakes, no more itching ever again.
I did this regimen to my husband and it kept the whole mess away for over 7 years. Then, he developed chronic asthma from a moldy duplex we were living in and I had to go thru the whole procedure again.
Unfortunately, when he has to take certain asthma meds, the gnasty mess comes back - but so far using organic apple cider vinegar, coal tar shampoo and a good hot oil treatment afterwards seems to do the trick. I honestly believe that the apple cider vinegar is the keystone to controlling the fungus. You might smell like a salad for a bit, but it’s worth it not to have the greasy flakes gracing your wardrobe!