Make a water trap: Partially fill a shallow pan with water. Suspend light source securely above it. Fleas (and other bugs) are attracted to the light, jump or fall into the water and drown. (Catherine Rigby)
Water's surface tension enables many small insects, such as fleas to be able to walk, or hop right across water. A few drops of liquid soap (earth friendly brands work fine, too), should be added to the water pan. This breaks the surface tension of the water, causing the insects to drown. (Siberia)
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