There is a greenhouse grade of plastic film which is UV resistant and should last for several years. It is what commercial growers use on their big hoop houses and the illegal dope growers here use it by the boat load...
I looked into the commercial stuff online before we moved 3 years ago. It was such huge sizes, along with the price for the huge rolls, that I dont use that. We just need 6 pieces 32” x 58” for 3 months.
If I really wanted to advertise that we are deep South rednecks, I would use unpainted plywood.
Hmmm... maybe if I painted some plywood to match the house. lol