This may have been covered before; if it has I apologise as I haven't found the thread.
Plastic dye is the way forward, I've used it now on some of #360's faded internal and external plastics (grey and black). It is not a paint, as the name suggests it dyes the plastic, it doesn't scratch for flake off.
An example of where I've used it is the door pockets, they go that nasty white colour. You can see around the switch area what colour it should be:
After applying the dye:
They literally look like new.
It does the same to the black external plastics. I'm going to try the grey on the tailgate trim tomorrow.
Paul