I'm a sucker for new toys. Has any one tried one of these for rust. https://www.autoblog.com/2016/08/30/laser-rust-remover-video/
Not only would i use that on every square inch of my car, but I'd get all that old dingy paint off of the window and door trim in the house.
Base prices of $53k... whoa... Harbor Fright will have them for $19.95 in 5 years... But it would make a great side business for someone, go to sites, use their electricity and get paid big $$.