Antimicrobial compositions

1. A method for skin sanitization, the method comprising:

contacting the skin with foam formed from a foamable antimicrobial composition comprising at least 50 wt. % of a C 1-6 alcohol, from about 0.02 to about 10 wt. % of a C 6-10 alkane diol, based upon the total weight of the antimicrobial composition; and a foaming surfactant selected from the group consisting of siloxane polymer surfactants and fluorosurfactants, wherein the antimicrobial composition is devoid of auxiliary antimicrobial agents.

2. The method of claim 1 , wherein the diol is 1,2-hexanediol, 1,2-octanediol, 1,9-nonanediol, 1,2-decanediol, 1,10-decanediol, or a mixture thereof.

3. The method of claim 1 , wherein the diol is a C 6-8 alkane diol, or mixture thereof.

4. The method of claim 1 , wherein the diol is present in an amount of at least 0.05 wt. % , based upon the total weight of the antimicrobial composition.

5. The method of claim 1 , wherein the diol is present in an amount of from about 0.2 to about 0.75 wt. %, based upon the total weight of the antimicrobial composition.

6. The method of claim 1 , wherein the foamable composition comprises from about 0.002 to about 4 wt. % of a siloxane polymer surfactant, based upon the total weight of the foamable composition.

7. The method of claim 1 , wherein the foaming surfactant comprises a siloxane polymer surfactant that may be represented by the formula

R 2 —Si(CH 3 ) 2 —[O—Si(CH 3 ) 2 ] a —[O—Si(CH 3 )R 3 ] b —O—Si(CH 3 ) 2 —R 2

where R 2 and R 3 independently include a methyl group or a moiety that may be represented by the formula

—(CH 2 ) 3 —O—(CH 2 CH 2 O) c —[CH 2 CH(CH 3 )O] d —(CH 2 CH 2 O) e H

with the proviso that both R 2 and R 3 are not CH 3 , where a is an integer from about 3 to about 21, b is an integer from about 1 to about 7, c is an integer from about 0 to about 40, d is an integer from about 0 to about 40, and e is an integer from about 0 to about 40, with the proviso that a>3×b and that c+d+e>5.

8. The method of claim 1 , wherein the antimicrobial composition comprises at least 60 wt. % alcohol, based upon the total weight of the antimicrobial composition.

9. The method of claim 1 , wherein the alcohol is methanol, ethanol, propanol, butanol, pentanol, hexanol, or mixtures thereof.

10. A method for surface sanitization, the method comprising:

contacting the surface with foam formed from a foamable antimicrobial composition comprising at least 50 wt. % of a C 1-6 alcohol, from about 0.02 to about 10 wt. % of 1,2-octane diol, and from about 0.002 to about 4 wt. % of a siloxane polymer surfactant, based upon the total weight of the antimicrobial composition, wherein the composition is devoid of auxiliary antimicrobial agents.

11. The method of claim 1 , wherein the tested antimicrobial composition provides a log 10 reduction of at least 2 after one wash, and at least 3 after ten washes.

12. The method of claim 1 , wherein the tested antimicrobial composition provides a log 10 reduction of at least 3 after one wash, and at least 4 after ten washes.