Tips for killing fleas?

i recued my cats kittens from my old house and brung them to my new one. we've had them for 2 months and gave them all away around 3 weeks and we've kept them in my room. we set off a ''bug bomb'' in my room and when i go in my room to get clothes or something else 10-30 fleas pile up on my leg and foot and now they are spread around the living room and kitchen