Rentokil wasp nest destroyer foam is a fast acting foam jet to be used on visible nests it can be used indoors and outdoors and sprayed from distance for safety its effective within 24 hoursto use spray early morning or late evening when most of the wasps will be in the nest we recommend you wear protective clothing to protect against stingswarningirritant flammable dangerous to the environment keep out of reach of children and always read pack instructions active ingredient d ph