Looking for a car detailer

I have a 2010 Mercury Milan,Tuxedo Black Metallic. I just saw a couple light scratches on the door. I tried Dupont Polishing Compound. It didn't completely remove them.
I now have a Dulled looking area where i used the compound. What should i do to fix this ?
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Dell Inspiron
Pentium dual-core 2.2 GHz
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Polish!
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