High-pressure water streaming can easily damage delicate materials, meaning you should never power wash asphalt shingle roofs (as high pressure strips protective granules), older lead-painted surfaces (which creates toxic dust hazards), soft natural woods like cedar or pine on intense settings, electrical meters, exterior light fixtures, fragile antique brickwork, window screens, living plants, and automobile body panels where narrow high-pressure nozzles can strip automotive paint and dent metal panels.
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