Final answer:
The reason you should have the homeowner vacuum after treatment for fleas is to remove dead adults and eggs.
Step-by-step explanation:
The reason you should have the homeowner vacuum after treatment for fleas is to suck up dead adults and eggs. Flea eggs can be found in various areas of the home, such as carpets, bedding, and furniture. Vacuuming helps to remove these eggs, preventing them from hatching and continuing the flea life cycle. Additionally, vacuuming can also pick up any dead adult fleas that were killed during the treatment.