CJT wrote:
George E. Cawthon wrote:

sniphe

best concentration of alcohol is about 70 percent (140 proof), a
higher concentration is less effective. snip


Curiosity question: why is higher concentration less effective?

To really understand you have to know the
structure of microorganisms and what the alcohol
does. Here is the simple answer. Higher
concentrations cause the the cell walls of
bacteria to become impenetrable stopping entry of
the alcohol and dessication of the cell.