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    It says "kills 99.99%" of bacteria, but how do i know that they are not lying? I mean how do they actually work?

    my teacher said that they don't really kill that much bacteria as they are not working at their optimum temperature, which might I add, is higher than what is safe she says.

    Enlighten me
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    (Original post by flou_fboco2)
    It says "kills 99.99%" of bacteria, but how do i know that they are not lying? I mean how do they actually work?

    my teacher said that they don't really kill that much bacteria as they are not working at their optimum temperature, which might I add, is higher than what is safe she says.

    Enlighten me
    It's basically a marketing manoeuvre. No detergent or hand wash can kill all bacteria. However, detergents can kill most of the bacteria to keep the pathological populations low. No proper scientific study has yet proven how many bacteria detergents can wipe off.

    As to that point about an optimum temperature, that is significant only in detergents containing specific enzymes. For that, it must be specified on the detergent container as to what the optimum temperature is.
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    (Original post by Dynamo123)
    It's basically a marketing manoeuvre. No detergent or hand wash can kill all bacteria. However, detergents can kill most of the bacteria to keep the pathological populations low. No proper scientific study has yet proven how many bacteria detergents can wipe off.

    As to that point about an optimum temperature, that is significant only in detergents containing specific enzymes. For that, it must be specified on the detergent container as to what the optimum temperature is.
    so they lie? :puppyeyes:
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    Its not that hard to kill bacteria - there are extremely few bacteria that can survive direct contact with the harsh chemicals in say bleach*. The problem with bleach comes when contact is avoided - small cracks in a floor, the bits on your hands the soap doesn't touch. So its the conditions that are vital in any quantative claim. The conditions that they use to come up with the 99.99% figure? Anyone's guess.

    *though say 'never' at your peril! Bacteria have been cultured from the outside of spaceships, meaning they've survived not only a vacuum, but also the intense heat associated with a rocket launch...
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    (Original post by nexttime)
    Its not that hard to kill bacteria - there are extremely few bacteria that can survive direct contact with the harsh chemicals in say bleach*. The problem with bleach comes when contact is avoided - small cracks in a floor, the bits on your hands the soap doesn't touch. So its the conditions that are vital in any quantative claim. The conditions that they use to come up with the 99.99% figure? Anyone's guess.

    *though say 'never' at your peril! Bacteria have been cultured from the outside of spaceships, meaning they've survived not only a vacuum, but also the intense heat associated with a rocket launch...

    oh i see. Thnax
 
 
 
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