A pressure washer can blow a hole straight through a pool cage screen

Florida pool cages and lanais are screened with a fine fiberglass or aluminum mesh that's held into the aluminum frame by a thin rubber spline pressed into a groove around the edge. That mesh is built to keep bugs, leaves, and debris out — not to stand up to concentrated water pressure. Aim a pressure washer at it and the spray can stretch the mesh, tear a panel outright, or blow the whole screen loose from its spline.

The same humid climate that coats pool enclosures in algae, mold, and mildew so quickly is also what tempts people to reach for the strongest spray on hand to blast it clean — exactly the wrong tool for the job. A mild cleaning solution at low pressure kills the growth itself, so a soft brush and a garden-hose rinse lift it away without ever stressing the screen the way a pressure washer does.