i have a large section just outside my front door of my brick house that has ivy and another flowering ivy in it. It is a mess and i want to remove it. Since it is such a large area and we have 2 children under 2 years old, how can i kill the stuff without hurting the children? ( the windows are open most of the day right above the ivy). we also have 3 birds, inside and have to be very careful what we use around them, 3 cats also. what can i do?