Palmolive dish soap can kill adult fleas on contact by breaking down their protective coating and causing rapid dehydration. It must be applied directly with soap and hot water.
A homemade mixture of hot water, salt, Palmolive, and rubbing alcohol may kill common flea species if prepared correctly. However, it is unlikely to kill flea eggs because it acts too slowly.
Pet owners should exercise caution with home remedies and consult a veterinarian for safe, effective flea control, especially for young, sick, or sensitive animals.