Armorall protectant. It's not a paint but it brings back the colour and shine to faded plastic and rubber.
Widely sold at motorist's shops in little spay bottles, but, better value, you can buy it in jugs from factors, ebay and online. You may get a free refillable sprayer with the jug. If not, you can use a brush, or a plant mister.
Also good for valeting tyre walls, rubber bumpers and strips on cars, dull painted surfaces, and gleaming up under the bonnet.