Before coming for a visit, my son (from out of state) noticed fleas in their house...He did what he thought was a good cleaning and then set off 8 bombs right before he left...The house has been empty for 2 weeks and on returning home, found there are more fleas to contend with....The dogs are both treated and don't have any fleas but what can he do about the house? He's really upset after doing all the work and using the flea bombs and it didn't work.....