Bleach Episode 216 _TOP_
Alternatively, large pieces of chametz may be placed in outdoor garbage pails, provided there is an eruv, but the chametz must be rendered inedible by pouring bleach or ammonia over the entire surface of the chametz. One must be certain that the bleach or ammonia saturates the entire piece of chametz. These fluids must be designated for that use before Shabbat, otherwise they would be muktzah.
Bleach Episode 216