Clean insect-screen mesh gently; a screen is not a fall barrier
Follow the screen maker's instructions; use mild soapy water and a soft brush, and never rely on the mesh to prevent falls.
Andersen recommends a soft brush with mild soapy water for many insect screens. Removal instructions depend on the window. Do not lean outdoors, especially at height, to clean or remove a screen. The U.S. CPSC warns that insect screens do not prevent falls.