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Step 1: Disassemble zapper
Remove The protective plastic cage and remove the light bulbs. If these steps do not also remove the top electronic cover, leave it in place, no modifications to the electronics are necessary. Unsolder the wire that comes from out of the top of the unit and attaches to the top of the outer wire zap screen. Carefully remove the outer zap screen and any ceramic spacers. Cut heavy black plastic, such as 6 mil landscaping plastic, to a size and shape that will go around the inner zap screen once with a some overlap. Secure the plastic to the inner zap screen using an ordinary office stapler as far up as you can reach with it. If the top of the plastic needs securing, make a complete wrap of electrical tape around it, plus some overlap.
Step 2: Reassemble the zapper
Hang the zapper somewhere outdoors where it will not attract mosquitos to where people might gather, up where it cannot be reached by people or pets.
Step 3: Clean the Zapper