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Date:         Thu, 12 Jan 95 15:49:54 PST
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         Al Knoll <alf@hpptc38.rose.hp.com>
Subject:      Rain-X:How wipers work

Ever have a product that works TOO WELL? Rain-X is one of those. As an anti-wetting agent it is simply superb, so good it doesn't leave enough water on the windshield to lubricate the wipers. Now rubbing a rubber wiper across a dry windshield will cause skipping and abrasion and wear of that wiper pretty quickly and sure enough, that's what happens.

A wiper floats on a thin film of water and slides easily when this film is present. Without the film, the rubber drags on the "dry" surface and the spring action of the wiper arm and associated mechanically articulated magic gizmos cause the wiper to skip. Each time the wiper blade skips it leaves a microscopic pile of rubber on the glass. Each pile begets another pile and like topsy just grows until you have this dark patch on the glass. Easily removable with a number of nasty solvents, this residue is a clear or not so clear indication of fast wiper degradation soooo just run the wipers on intermittant or use old decrepit wipers that work poorly on non treated glass.

As a prank, surreptitiously rain-x only the driver's side of someone's conveyance, passengers will approach panic as they can't see at all while the driver has excellent visibility. Stuff also keeps the snow buildup down and makes it easy to get the ice and road groad off. -- -- ___ / __ __/ ____/ Al Knoll HP Performance Technology / / / / / Center Roseville, CA, USA 95747 / _____/ / / 916.785.5317 (Telnet 785-5317) / / / / email: alf@hpptc44.rose.hp.com / __/ __/ ______/ ___________________________________/


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