We used Frida baby "oh crap cradle cap " shampoo and used the comb and sponge and get it out by 2nd use my son had a mild case of it built real bad on front part of his head 2yr old. I highly recommend it. Hasn't come back since.
Breast milk!
Frida baby had these three brushes which were helpful
We used Dentinox cradle cap shampoo and a soft brush. It worked wonders and cleared up in about 4/5 uses x