Best way to remove surface rust on sandblasted sheet metal

Sandblast that old 40 year old fender a few more times, ...what is left!!??? lol I agree sandblasted metal I best, but even the guy in Ca. needs to to let it sit!!
I did not read where the fenders had been sandblasted more than once and that they would be blasted more than once again or that they are 40 years old which should have no effect on them other than if they were left to rust. For all I know from the post it could be a tractor fender. He asked a simple question, I gave the simple answer to the choices that were provided. :)