Hey guys just picked up a zilla critter cage off Craigs list. The person that had it before me had RES in it. She let them go in the canal . Yeah I B*** at her fo rit. anyways the tank has that hard white water stains on it. How do I get that off? I washed the tank with dawn dish soap and gonna hit it with diluted bleach later on. I'm just gonna use the tank for a snake. I know the tank can't really hold water so I was a little confused when she told me she had RES in it. So can anyone help.