That trim cleaner with the brush did a great job! I may have to try that on my dads 2008 Frontier! The bumper step and plastic around the windshield wipers has turned very light despite it being a very well cared for truck. Usually I use 303 but it doesn't last long.
That Back to Black on that Xterra will probably last less time than your 303 honestly. If you want to transform black trim and have it stay a while use something like DLUX. That said based on the OP's post the owner didn't want to invest the time much less the $.