How can you remove spray paint from plastic safely?

I painted a Nintendo nes silver 5 years ago but some parts i painted look rough and i want paint it over again with a new color and add a clear coat which should make it look real nice.How can you remove spray paint from plastic safely?
using a Spray Paint Graffiti RemoverHow can you remove spray paint from plastic safely?
Sand it all smooth with some 300-400 grit sandpaper(auto parts store type) and shoot another coat over it. I you really want to remove it, anything you put on it to dissolve the old paint may get into the inside and ruin the device.
nail polish remover or lighter fluid