High-pressure water streaming can easily destroy delicate materials and cause costly property damage. You should never pressure wash asphalt shingle roofs (as it strips protective granules), older lead-painted surfaces (due to toxic dust dispersion), soft woods like cedar or pine on delicate settings, electrical meters, outdoor lighting fixtures, fragile antique brickwork, window screens, living plants, or cars using high-pressure narrow nozzles that strip paint and dent body panels.
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