Hi, I've Had Scalp Psoriasis For Over 50 Years. It

Hi, I've had scalp psoriasis for over 50 years. It started out small but over the years and with added stress has become a major issue. Shampoo every day, brush scalp every 2 hours, shake out clothes and sweep floor, have come to accept the challenge, have used every conceivable remedy including Rx cremes/ointments all without success. It went into remission about 20 years ago, but stress and financial issues brought it back stronger than ever. Is there a shampoo you could recommend (tar doesn't work)?
Many thanks :)