What can I use to protect/shine these metal bumper guards?

[AGAuto]

I have a black front bumper bull bar and a rear bumper guard on my daily driver. Recently I noticed that they are starting to fade color a little bit, and I was wondering if there was any products out there that could protect/shine these guards? I have quite a few products and I`m wondering if I could use any of them, but I am open to any suggestions.



Here are pictures:

[Accumulator]

I`d use an AIO and then top with your LSP of choice. I`ve even used mild polishes on satin/matte black without overglossing it.



Not sure which AIO you`ll like best, I choose between KAIO, ZAIO, and Autoglym SRP. One of those usually does the trick..and then there`s VM, but I haven`t used that for such stuff in ages.