How do you clean/remove rust on the inside of chrome bumper?

The chrome Man the chrome...
Having my rig truck always next to buildings on construction sites, I always inquired when masons were going to power wash bricks. They use a mix of muratic and water, that I did not want overspraying on my truck.

All their spray rigs the paint was fine, but every trucks chrome bumpers was rusted to ****.

Must be the time it was on the chrome because I pretty much rinse rust off with it and rinse the area with clean water after.
I have never let it stay on long.