If applied correctly the first time, there is no need to re-apply R.I.P. Fleas Extra for the next 12 months. R.I.P. Fleas Extra may need to be re-applied if the product has been removed by washing, wet vacuuming or shampooing floor surfaces. If any new soft furnishings, sofas, rugs or carpets are purchased during the 12 month period, they will also need to be treated.