I just moved into a new home and inside the garage there is and old bathtub that I think was used to make pottery. I am planning on using it to brood my first chicks in April. It is filled with clay and a bunch of other unknown substances. There was a dead mouse in it that I found but I got it out. Besides washing all the mud and clay out, what should I do to prevent my chicks from getting sick? Should I bleach it or not?