What is the best method to remove gray marks from white paint on a 2014 C 250. These are not scratches, they are marks caused by something rubbing on the paint. They would not show at all except the car is white. Thanks for any advice.

 

I would try a clay towel or clay mitt or clay bar. I use a clay towel on my car a few times a year to clean the paint. I have the nanoskin medium clay towel and really like it. Ill use it when washing the car, dunk it in the car wash bucket with Meguiars Gold Class car wash soap.