I can get by if just doing normal tunnel vision commuting or around town to known spots, but if trying to eyeball stuff from a car in rain this stuff really makes a diff.
Really helps the side/rear windows too, although marketed mostly for front.
It can be applied in the pouring rain, like when my wipers quit and ducked into 7/11.
Lots of folks are really amazed by this stuff at first, like when you first used a teflon pan. If I was running a car wash this is what I'd use to amaze customers.

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