Wash it with Dawn Dishsoap, cleans surprisingly well.
Other than that, the original finish is used up.
Needs a coat of Clearcoat used on the basecoat/clearcoat paint systems to save and protect what is still there.
Same as I did on my badly faded '89 Truck.
Clearcoated it one panel at a time under the Sun awning here in Florida. Really brought it back to life and now it is protected from the Ocean salt mist and the intense Sun as it sits outside here... no garage.
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Have not cleared the passenger box side yet as you can see it is still faded, have some body work to do yet on that panel.
Big difference with minimal amount of work and expenses.
One of my old 67 Dodge dart was matching the original paint on.
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☆☆☆☆☆