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Use lots of water in washing your windows with a scrubber. Your aim must be to just get the dirt off your window. Use a generous amount of water on the interior glass of the window also, but be careful not to let the water stand on the woodwork.
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Remember to wipe the rubber blade after each squeegee stroke with a lint free cloth. If you place a wet squeegee on the glass it will put a blade mark. Do not worry, with practice you will be able to wipe the blade quickly.