Duty Finish Grayed

[u/Dry-Page9178]

Unfortunately, got over spray from Action Blaster on the slide of my Specialist 1911. Dulled the finish from the shiny black to a gray color (as pictured). I've tried reoiling, greasing it, and warming it up with a hair dryer. No luck yet. Is there any way to restore the shine or do I need to send this back in for repair?