You could flea bomb the place, but that's rather yucky. I'd say to wash any clothing or toys or blankets that may have been in contact with B&B, and immediately give them a bath when you get home, to be as safe as possible...
Here's an article I found:
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Controlling fleas in the environment -- indoor control
Grooming
Combing your cat or dog daily with a flea comb is an important part of flea control. Bathing animals regularly is also advised. There is no need to use chemical flea shampoos. A water bath with a gentle soap that won't irritate their skin is sufficient to eliminate existing fleas.
Set a trap
You can trap fleas by placing a dish of soapy water under a night light near where your pet sleeps. Fleas are attracted to warm light and will easily drown in the soapy water. This works for adult fleas only, but with diligence, can be very effective reducing the flea population. Fleas already residing on your pet aren't likely to leave, so you will still need to flea comb and/or bathe them in a mild shampoo (even a baby shampoo will work as fleas don't survive well in soapy water). If the idea of keeping a soapy water dish near your pet is not attractive, plug-in flea traps are available. They use a sticky pad in lieu of the soapy water, and are equally, if not more, effective. (They seem to work well for ants, as we have noticed in our personal experience.)
Sanitize your pet's environment
Fleas lay their eggs everywhere -- in carpets, curtains, upholstery, animal bedding, cracks and crevices. Destroying the fleas' eggs by thorough weekly vacuuming and frequent washing of animal bedding goes to the source of the problem and will help eliminate the flea population in
your house. Keeping clutter on the floor to a minimum also will deprive the fleas of hiding places.
Flea Away -- Diatomaceous earth
Diatomaceous earth (Flea Away) sprinkled under furniture and into other nooks and crannies around your house will kill fleas and flea eggs by cutting into their waxy skin and dehydrating them. It may also be safely applied to your pet for the same effect.
Outdoor control
Nematodes
While you can't kill off the fleas that your pet is going to encounter when it goes outside, you can keep the population down in the area around your house by using nematodes. These microscopic worms eat flea larvae (and reputedly ignore the "good" bugs) and are therefore a natural way to control the flea population.
You can purchase nematodes at pet and garden stores. Place them in moist, shady spots near your house; neither fleas nor nematodes survive in the hot sun. As nematodes multiply rapidly, you have only to introduce a small number to have the desired effect.
Flea Away may also be used outdoors. Apply on dry walks, dry decks, dry patios, dry lawns.
http://eartheasy.com/article_natural_flea_control.htm