Accidentally discovered how to keep my full front windshield 100 percent free of dust. I use "Meguiar's" Mirror Glaze #34 called 'Professional Final Inspection' on all my plastic surfaces for a really durable shine, also helps alot of dirt from sticking. I decided to try it on my windshield cause dust was a problem on inside and outside. After applying a liberal amount, letting dry for a minute or two, then buffing with a clean rag (I use a tee shirt) I haven't had a speck of dust cling to my windshield since. This spring in northern MI is very very dry so very dusty. Accidental discover was great!! PS I got the Meguiar's at autozone in a 16oz spray bottle for 7.99.