Things You Should Never Pressure Wash
Fragile panes of glass can’t hold up to the high-pressure spray produced by a pressure washer.
The power produced by a pressure washer can force water through the narrow cracks and crevices, causing damage to the incoming electrical system
The high water pressure removes the granules from asphalt shingles and it can break shingles if the roof is older.
A pressure washer could pull the gutter off the house or cause damage to the downspout.
The powerful stream of water can pull mortar out and cut into old brick, resulting in significant structural damage
A pressure washer can cause dents and chips in the paint; it can also force water into the cracks and crevices of the engine
If you don’t want to chip, peel, or otherwise damage the stain or paint, then avoid using a pressure washer.
The high-pressure flow of water can break glass or bulbs and may completely remove the light fixture from its mount.
While a pressure washer would remove debris from the outside of the air conditioner, it also can bend or crush the fins, restricting airflow into the unit.