WOW! And only a heat gun??? Did you use the low setting and take it super duper slow? Covering everything a few times? No carb cleaner, just heat, after a good wash? That's truly amazing. Thanks for sharing!
Just wiped it off with a rag and started hitting it full bore with a heat gun. Would go over it till it changed color and let it cool. No chemicals and no paint. Total transformation. After this it will get a good primer and be on its way to a Jurassic Park Jeep.