The house should be vacuumed thoroughly prior to spraying. This allows R.I.P. Fleas Extra to penetrate deep into carpet fibres. Where possible, move large items of furniture and vacuum and spray underneath. You should also vacuum rapidly 24 hours after spraying and thereafter at least twice weekly for the next two weeks. The vibrations and warmth create a stimulus for adult fleas to emerge from the otherwise impenetrable pupae and shortens the pupal window. A handy hint is to vacuum living areas before going to bed and bedrooms in the morning. This will mean that rooms are vacant after vacuuming, reducing the chance of fleas biting you.