i have soaked so many times its unreal. and i clean out the cage every time, i clean all the glass with a vinigar solution. i am using news paper for substrait. im even going as far as folding paper hides. the only thing that is in the tank that does not get thrown out and replaced is a plastic water bowl. i was reading a bunch of other threads and one said to put cooking oil on the head when i soak it. it didnt say what kind of oil to use. will vegitable oil work? and what sholud i wash the oil off with after im done soaking?