Can polmolive dish soap kill fleas?

Polmolive dish soap can effectively kill adult fleas on contact without any additional ingredients as it acts by causing their protective coating to lose integrity through rapid dehydration. But it must be applied directly to them using soap and hot water. To make a homemade insecticide with Polmolive, mix four cups hot water, a cup salt, a tbsp Polmolive, and a cup rubbing alcohol; it kills most common flea species if mixed correctly.. It is very unlikely to kill flea eggs because it acts too slowly. Borax kills adult fleas and desiccate most of their eggs