What will stop Bleach meaning what will neutralize bleach?
Bleach is a 3-5% solution of sodium hypochlorite [NaOCl]. It is rapidly
reduced by reducing agents. One reducing agent that is fast,effective,
available, and cheap is sodium sulfite [Na2SO3] -- not sulfate [Na2SO4].
It is available from any swimming pool chemicals retailer. It will be
called something like "knock down", "de-chlor" or similar trade name. It
is used to reduce the level of chlorination in swimming pools. I use it
myself to de-chlorinate my bathing suit after swimming.
Sodium thiosulfate [Na2S2O3] will also work. It is used in developing
photographic film and prints. Its common name is "Fixer". It is available
in any photographic supply store, but is likely to be more expensive than
In principle, ascorbic acid [vitamin C tablets] should also work. It is a
reducing agent, but I haven't tried it myself to neutralize bleach. I have
used it to "bleach out" certain stains in clothing, because some dyes,
when reduced, become colorless. It works very well on certain stains.
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Update: June 2012