When i cleaned cookers my oven cleaner supplier informed me that sometime this year new legisalation is coming in regarding disposal of waste water with oven cleaner ph14 in it, it will need to be taking to a water treatment plant, when i lived in Shaftesbury Dorset i would of needed to go 30 miles to Bournemouth to be charged £15 a gallon to dispose of it, and on top of the that te supplier had a duty to inform the relavant bodies who was getting the chemical.LETS HOPE THAT DOSENT HAPPEN TO CC. PAUL