Two years ago my car was so dirty I decided to hire a mobile auto-detailer as a last ditch effort before I bought a new car. The price was not cheap, as it came to $600. I never used that guy again, however living in Aptos, CA (near Santa Cruz) I found a much better deal for auto detailing in Santa Cruz.
I called several auto detailers on Yelp and one guy I called two or three times and could never get an appointment. Then I found Javier's Detailing. He is located at 1800 Soquel Ave in Santa Cruz behind May's Sushi. You can reach Javier directly at (831) 214-3987.
About 6 months ago I had Javier do a full auto detailing, claybar, shampoo, engine cleaning, the works. He had my car for about 5 or 6 six hours and charged me $250. I was blown away by how well a job Javier did, so I took my wife's truck and my Mercedes to Javier as well.
He also offers a car wash and vacuum for $40. That's the cheapest price in town and he does it by hand. I get the cars deep cleaned twice a year and get the regular car wash every 2 months. I highly recommend you give Javier's Detailing a try if you're looking for an auto detailer in Santa Cruz, CA.