Spa scalp treatment

I'm working on a scalp treatment to add to a spa treatment but am a bit unsure what would work.

i've considered using an aroamtherapy blend and massaging that into the scalp and hair shafts giving an extensive scalp massage.

I've also considered using dead sea mud or rhassoul mud. Espa use a pink scalp mud that is supposed to be lovely.

I have bought some disposbably shower caps to put over the hair to keep mess to a minimum.

any suggestions?

I've got shower, plus work above a hairdressers, but I could also wash the hair whilst they lay on the couch, well enough so they could get in the car and drive home.

I've learn't shirodhara so am used to clients being in a bit of an oily mess, but I would like this to be more of a finished article than leaving the client with oil oozing from their hair.