flea population

Can you tell if bathing my dog in Dawn Dish soap can help with the fleas.  My Vet told me to bath her in the dawn dish soap.  I did that on Monday morning and checked last nite and this morning and have not see a flea on her belly.  She also isn’t itching and biting now.  She is allergic to the fleas.  I have been to the Vets since June till now.  She has been having the treatments every month, but it seems that the bath has helped.  Is it my e imagination or is that true is does work?

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