Have you used any type of rubbing compound to bring back the color? I use a product called Flitz, it is an extremely fine cleaner compound and does a great job of not harming the color paint and brings back the hidden color. Then use a cleaner polish or wax to seal up the paint once it is polished.
https://www.amazon.com/Flitz-BU-0351...polish+-+paste Read the reviews to see why it is so reccommended.