Depending on how much/how long you have to spend claying the car, I would charge anywhere from 60-100....I have had to clay for 3 hours on a fullsize with a shell on it before...it hadnt been polished or waxed, never clayed, in 7 years....needless to say, a 10 minute clayjob is not what that car needed. I never understand how people get by with taking only 15-20 mins to clay a whole car....with my full detail, I talk to the customer and show them what clay does....then I tell them 1 hour is included, and its 30/hr if they want me to continue