Despite being regularly flea and worm treated, my cat has brought us fleas and we’re being bitten. I’ve got flea spray which feels like a difficult task, given that I need to spray every room and leave for 24 hours. Am going to have to stagger the bedrooms which makes me worry the fleas will spread again if I don’t do all the rooms at once. I’m hoovering like mad. Any other tips I need to know to get rid of them quickly?