We wash first, always
The loose grit and traffic film have to come off before clay touches the paint. Then we use plenty of lubrication and work the remaining bonded contamination out of the finish. That's the material that makes clean paint still feel like sandpaper under your hand.
Depending on what's there, we may use iron remover or another chemical step before clay. If chemistry can remove something without extra rubbing, that is usually the better first move.
Clay can leave its own marks
People don't always realize this. Clay is touching the paint and pulling contamination across it. On some finishes it can leave light marring, even when it is done carefully. If the car is getting polished next, that is usually not a problem. If it isn't, we need to talk about the finish you expect.
Clay will make the paint smoother. It will not remove swirl marks or scratches because those are in the clear coat, not sitting on top.
Related services
Questions we hear about Clay Bar Treatment
How do I know if my car needs clay?
Wash it first. If the paint still feels gritty or rough, bonded contamination is probably there. We'll check whether clay, chemical decontamination, or both make sense.
Does clay remove wax or coating?
It can weaken or disturb existing protection. Tell us what is on the car so we can plan the service around it.
Do I need polishing after clay?
Sometimes. It depends on the paint, how contaminated it was, and how picky you are about any light marring left behind.