How do I maintain Single Stage Acrylic enamel?

I'm asking for tips on maintenance and care for this type of paint, single stage acrylic enamel with hardener newly sprayed. I have to park it on the street unfortunately but what I'd like to know is when I take it to get detailed how should i polish it? How do you polish a SSAE metallic paint job? I plan on only spraying it with cold water for the new few months while it cures, thanks for that tip. But lets say 6 months goes by and it start to fade and oxidize how do I polish it?