I am no authority on this but your best bet would be to use the Jopasu duster every morning and a weekly stint with ONR should suffice. If you can't get your hands on ONR, you could use any good Car Shampoo once a fortnight. I have tried Eagle One Easi Dri and Meguiar's. I would go with Eagle One. You could also buy a good spray wax to use after the wash, as an added layer of protection. The only thing to be careful with is the bird droppings and they should be removed at the earliest. use a MF towel and Meguiar's Quick Detailer for this.