Japan invented something like this a while back to help overstretched healthcare facilities. It scans your head, then shampoos and massages you using 16 robotic fingers. It can also remember your profile, making each experience the same. Check it out here.https://phys.org/news/2010-09-japan-panasonic-robot-hair-washer.html

Japan’s Panasonic develops robot hair-washer

Link: https://phys.org/news/2010-09-ja

Japan’s Panasonic on Thursday unveiled a robot that can scans a client’s head using 3D technology, then shampoos their hair and massages the scalp with its rubbery “fingers”.