While I was browsing care2.com I came across this article and found out about using vinegar to kill weeds, for those that asked:
Kill weeds and crabgrass growing in sidewalks and driveways by pouring vinegar onto them. A half-and-half solution of vinegar and water can even kill garden slugs if it’s sprayed directly onto them.
Read more:
http://www.care2.com/greenliving/23-...#ixzz1Ksfeot2O