Although glass deck panels require regular cleanings, inside and out, the cleaning itself is not difficult. Use a mixture of water and dish soap, a 1:1 mixture of water and vinegar, or regular window cleaning spray. Wipe clean with a microfiber cloth. For stubborn dirt and bird droppings, first spray to soak with vinegar, then lightly scrub. Do not use abrasive cleaning pads, since they could scratch the glass.