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Simply so, can a clay bar remove oxidation on headlights?

Automotive detailing clay isn't just for paint! You can use detailing clay on any smooth, hard surface, including glass and chrome. But never use clay on clear plastic, such as headlight lenses. Detailing clay will safely remove stubborn, embedded brake dust, tar and road film from all factory wheels.

Beside above, does Clay Bar damage clear coat? Clay bars are not supposed to damage the paint or clear coat finish, the particles that are being removed by the clay bar might remove some of the clear coat (see image below for example) the the damage these particles can do over time is worse than the clear coat being removed - and this valleys will be filled in with

Then, how do you remove oxidation from car paint?

Light-to-moderate oxidation can be removed with polishing compounds, while heavy oxidation requires a rubbing compound. Apply the compound gently to a small area, work it into the paint and remove it quickly, repeating until all signs of oxidation are gone.

Do you have to polish after clay bar?

You don't have to polish afterwards but clay bars will mar the surface. You may not see or notice it but it is there. Depending on how fine a grade the clay is, you may have to do an intensive polish or just a one-step wax.