I removed these from the truck to give access to the front axle. They were bent weathered and had suffered from overspray.
I then searched on the internet about bumper restoration and didn't turn up much....I decided to try a repaint with kit from Halfords.
I am a fan of sugar soap as a degreaser/cleaner so started with that,then the wipes then the primer which you dont spray on but use to wipe off!
A few coats of paint involving another trip to Halfords for another can and I am more than pleased with the results.