I used the Refinish Restorer product mentioned above for years and have been pleased with the results.
I have now switched over to
CERAKOTE Ceramic Trim Coat.
My 2003 Avalanche Z-66 was in pretty poor shape since the original owner had never treated the plastic cladding during all of the years and the 241K miles he had driven the truck before I bought it.
Here are some pictures of the truck now after applying the CERAKOTE product.
View attachment 233139
View attachment 233140
As mentioned above, preparing the plastics with a good washing and drying is important, regardless of the product you use.
Also, understand that no product you wipe on is a permanent solution and they must be reapplied from time to time.
I usually reapply once a year or so and I am fine with that.
I typically don't wait until the plastics look really bad before I reapply.
I do not mind spending some quality time with my vehicles from time to time.
It's good for them and me alike.