Black plastic restorers

Evening all!
As I'm about to pour more money in to my Freelander 2, I have decided to give it a bloody good clean.
What's the best plastic restorer? There are so many to choose from! I have door handles and a front scuttle to restore as they've turned a dull shade of grey.
Thanks in advance

Ceramic Trim Coat

Try a hot air paint stripper on an inconspicuous area.
Can often make plastics like that look good again.
Don't go mad with the heat!

Diesel.
Cooking oil.
Heat from a hot air paint stripper.
Owatrol is quite good, lasts quite a while as well.

Wurth Bumper Dye.

Comes in grey and black. Lasts for years and isn't slimey or shiney like dressings.