Been using Rain-X for 30 years. Now use their product in my screenwash. It keeps the coatings refreshed and my wipers last longer as well. I'm trialling a nano coating by Enduro Shield bought primarily for my shower enclosure. Had some left over. So far, seem quite durable on the car.
Have you noticed that when the wipers work while the car is on the freeway, the change in airflow over the car causes a noticeable buffet.
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