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I have used RainX in my window washer water any it seems a film has appeared on windscreen over time. Ideas to remove film?

Thanks

There are a number of products that can break down film on a wiindscreen. In the old days, cold tea was always recommended, and while it might sound like an old wives tale, it does work. Outlets such as Repco will carry products designed for the job. A colleague in our office swears by a product called Sparkle. The other thing you may find is that there is a build up on your wiper rubbers, so replacement rubbers may also help.