After using Rain-X on cars for many years, with somewhat mixed results totally based on wiper use, I am in the process of putting it on all of my windows.
On road use, in moderate to heavy rain it works great (as long as you do not use the wipers!). With drizzle on the other hand, once you have to start using the windshield wipers, it produces that dreaded film. The film is removable mechanically, i.e. elbow grease and Bon-Ami, which doesn't have the abrasives that Comet or Ajax have.
Richard
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