Professional window cleaning requires mastery of special techniques. A window cleaner lacking in experience or training can take considerably longer to complete a project and the work may be lower quality. Moreover, the use of proper window cleaning tools results in a better clean than home methods such as rubbing windows with newspaper or a wet rag. Rubbing a pane of glass with a cloth can result in 'stroke' marks that are visible in sunlight due to the residue left behind.
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