Wow that really made them look like new again. Nice! My side steps are new... but I bet that penetrol would work on the mirrors and the door surrounds that are plastic. Flares too, but mine are painted...Restored my faded side steps with penetrol yesterday.
Before and after picks in my build thread.
https://wranglertjforum.com/threads/03-sahara-metalcloak-build.8821/page-3