in addition the manner in which the oils function is described in detail below and it will be readily apparent that other oils will function acceptably in accordance with the invention and can be readily determined in addition to the cruciferous oil the brine also generally includes a glycol an inorganic salt and water suitable glycols include but are not limited to ethylene glycol propylene glycol benzylene glycol butylene glycol diethylene glycol diphenyl glycol ethylidene glycol and the like any glycol can be used alone or in combination with other glycols propylene glycol is used in a preferred embodiment the glycol component is present in an amount between about 30 and 50 by weight of the brine more preferably between about 35 and 45 by weight and most preferably in an amount of about 40 by weight salts which are useful in accordance with the invention include but are not limited to calcium chloride calcium bromide calcium iodide potassium chloride potassium bromide potassium iodide and the like in a preferred embodiment calcium chloride is used the salt is present in an amount between about 5 and 15 by weight of the brine more preferably in an amount between about 7 and 13 by weight and most preferably in an amount of about 10 by weight water is present in an amount between about 40 and 60 by weight more preferably in an amount between about 45 and 55 by weight and most preferably in an amount of about 50 by weight in an especially preferred embodiment the brine includes between about 0 1 and 0 5 by weight cruciferous oil about 40 by weight propylene glycol about 10 by weight calcium chloride and a balance of water the.