On Wed, 22 Sep 2004 20:21:46 -0400, "Carolyn LeCrone"
wrote:

A neighbor uses vinegar to kill weeds growing in cracks in the street and
sidewalk. Does the vinegar degrade? Are there long term negative affects?
Carolyn


Household vinegar contains acetic acid which breaks down over time.
It is a weak acid. I probably would not regularly use an acid (weak
or strong) on concrete as this could weaken it and cause spaulding.
My choice is a propane torch or RoundUp--both are kind to concrete and
the environment.