im a professional detailer. first off. don't have the car wet sanded. they just want to make a quick buck when all they are going to do is caly the car with clay bar. and also depending on how bad the over spray is , if you were to clay the car yourself it would take you anywhere from 15 to 30 min to caly the whole car and remove the overspray. trust me, dont even pay 350 for it. RIP OFF do it yourself. all you have to do is buy the clay at a pep boys or autozone etc... wash the car real good. start with the roof line which is. all the windows, roof, hood, trunk, and side mirrors. then do the sides of the car but stay above the moldings. you dont want to drag dirt from the bottom up because that can cause scratches. after that then do the front of the car, then below the moldings, and then the back of the car. after the whole car is washed take the caly bar(work it so its flat) while the car is still wet, rub the caly bar on the car again starting from top to bottom. when claying you need patience. just keep rubbing, not to much pressure. as you rub the overspray will come off. that *BLEEP*es me off that someone will charge 350 for a tops 30 min job.