Clay has been around for some time. Vehicles built in the Midwest (Detroit) etc...are VERY prone to rail dust, industrial fallout and air pollution that can attack the fresh paint within days. Those covered rail cars are not covered all that well. Small metallic particles will land on the paint, moisture then causes it to breakdown (rust) and penetrate the paint surface. In severe cases, I have seen cars, white especially, literally be covered with small minute rust spots...caused by the fallout I mentioned.
Bottom line, Clay your car regularly if it is outside before waxing. Otherwise twice a year at least. It will be easier after the first time. Your paint will look brilliant for many years.
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