• Use a soft, dry cloth for the solar panel; avoid abrasive materials that could scratch the surface.

• For the case shell, a slightly damp cloth is fine; dry it immediately after.

• Keep liquid away from ports and the OLED display.

• Don't use solvents, alcohol wipes, or cleaning sprays directly on the case.

Keeping the solar panel clean makes a real difference to collection efficiency; even a light layer of dust reduces output.