I often pause before cleaning containers that are best cleaned outside because, frankly, I don't know where to put the backwash of detergent-filled water. I know environment-harming phosphates get into the streams, etc., when people pour this yucky stuff down storm drains or just let it seep into the water table. Still, I don't know where to put the stuff. It's not practical to bring it in and flush it in the toilet. Where do others dispose of this stuff?? I never took home ec so I learn as I go along ... :-{