Here is what Mitchell Gayor, MD of Cornelll University say's about clorine bleach... Most people use a wide variety of cleaning products, many of which contain toxic chemicals. Chlorine bleach is potentially carcinogenic and can damage the respiratory system.
Among its by-products are chlorinated hydrocarbons, chloroform and trihalo-methanes, all of which act like weak estrogens and cause breast cells to divide more rapidly. These by-products have been shown to cause breast tumors in animals.