Carnation foot care cryospray verruca wart remover freeze spray is a fast effective and easy to use treatment for the removal of verrucas and warts it works by rapidly freezing the verruca or wart without the need for gels creams or plasters one application is usually sufficient with the verruca or wart disappearing or falling off in the next 10 14 days persistent verrucas or warts may require two or three applications