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They will just continue to turn white. You can spray them with flat black trim paint made to paint exterior hard plastic mouldings. It is available at discount auto parts stores in a spray can.
Stosh...Try some.."Trim Shine"...made by STONER...I get mine at OReilly's..Worked wonders on my Jeep that sat out in the Florida sun..Might take 2-3 applications...but it's spray on...like Tire Shine..which they also make...j
I use a product called "303" on all my vinyl and plastic. Never was impressed with ArmorAll. I buy "303" at a marine supply, not cheap but I think it's worth it.
303 did wonders for the floor vents and kick panels I salvaged from a Kearney, Nebraska yard.
Might help on the *****. When I replaced my vent window I only used the glass and frame from the donor truck.
I use foaming tire spray. does a good job on the door panels, and dash pad too. I changed all my door handles to the chrome ones from the early model 80's trucks,I like the look of chrome