helloo, I am very new with my dreads but if it helps at all; I had the same problem and I was able to take care of it by using peppermint oil...as soon as I added that to my homebrew shamp (teatree, peppermint oil, BS+salt) it seemed to clear things up and got rid of that gross greasy feeling. I also had like minor flakes for a little while but those dissappeared after I added the peppermint oil, and also I like the smell .
I hope I helped! I'm sure there's better advice already posted, haha
updated by @erik: 07/23/15 06:45:03PM