Sean, I am glad that you found a product that finally worked for you. The only product that has ever made my wiper blades chatter is OCW. No *marketed* rain repellant product has ever given me any trouble with chattering. Reading through all of the posts, it seems that many people have very different variables for their chatter equations: windsheilds, wiper blades, wiper treatments, windshield treatments, or any combination of the four. This tells me that given a different automobile, under different circumstances, I might well experience chattering from a different source. Thanks for the info everyone! It might save me a lot of experimenting down the road.