Best product to restore black exterior plastic trim pieces?

[B4N M3]

I have a 1990 Jetta, and it has quite a bit of black plastic trim, most of it has gone to grey over the years.

What's the best product to use to make it nice and shiny black again?

[911fanatic]

You can have it redyed so its permanent or use a dressing like Poorboys Trim Restorer. I've had the PB on my bumperskins and it has survived two hand washes and one touchless over the last month.