Any help appreciated for mild scalp psoriasis

Hi Guys, I have been struggling with Psoriasis for the last five years or so. Usually it is very mild, but it does flare up from time to time and become severe. Anyway, I manage to keep the psoriasis on my body under control most of the time by eating well, exercising and moisturizing with Aveeno at least once or twice a day. However, my scalp is a different story. I can never seem to rid it completely from my scalp and it is always fairly itchy. At the moment it is very mild and I was thinking about overnight treatments to moisturize my scalp like oils or creams but I haven't heard about how to do it. Even when I think my scalp is actually ok, I'll go to the hairdresser and whilst my hair is being cut there are flakes everywhere. Does anyone have any advice? Thanks in advance!