anything I've seem that rubs on just ends up washing off in a couple months. My previous vehicle was a 2002 ford escape. Plastic Body cladding all around that was faded to hell. I thought it was nuts, but tried the head gun method and was blown away. The concept is that the fading is only on the surface (like.0001"). The heat gun melts the surface and the fading dissapears 100%. Theres really not too much technique to it, you would really have to hold it there to burn the surface. Dont even need to tape off the area! Plan on about 2 hours to do the whole truck and be patient. This is just a $20 heat gun from lowes.
nothing to wash away, next time you will have to do it will be in 10 years.
Here's an example on youtube:
https://www.youtube.com/watch?v=R9tDq1oRy9U