[F3RGY68]

Don't know which is best or whatever, but I thought of several ideas. It depends on if the powdercoat was done correctly, and what kind of spray paint.

A clay bar may be an easy way out.

Could try wet sanding with a finer grit sandpaper just until you saw gold; it may look dull but you could probably buff it out.

Other ideas are using chemicals like lacquer thinner, brake cleaner, or alcohol. Some will be less abrasive than others, but probably loosen it up enough for you to scrub or wipe off. However, wash it right after, so it doesn't stay on the powdercoat.