The poster asked for your advice on how to best dispose of bleach.
Why the sermon on lifestyle and tree-hugging?

Your not too big on hygiene, are you? I assume that one bar of
soap and one roll of toilet paper probably last you about 25 years.

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Norminn wrote
Created an ecosystem with bleach water? How about building a rocket and
flying the bucket to Mars? Get rid of the bird feeder and weed seed,
buy a shrub with some nice berries and let the critters eat what nature
provides. You might get "double duty" from a shrub with flowers that
attract butterflies.

You are "sterilizing" stuff the animals poop on? Save "sterile" for the
kitchen and bath. Better yet, clean is fine. Your animal friends eat
dead, rotting animal and vegetable matter, so they don't need indoor
sanitation in the outdoors.