This winter while I was looking on the internet for gardening tips getting ready for spring I kept seeing people mention using vinegar as a weed killer so I thought that I would try it out. After reading about various solutions I decided to try a vinegar and soap mixture and use it on my patio since it apparently kills indiscriminately and that is one place that I never want plants to be growing. 
I bought a jar of white vinegar from the grocery store and put three squirts of dish soap in it. I stirred it up and attached a squirt nozzle from an empty bottle of cleaner that I had saved. With the soap now in the vinegar I wanted to make sure that I wouldn't confuse it with edible vinegar so I used a sharpie to clearly mark "Weed Killer" over the vinegar label.
Armed with my spray bottle I set to work spritzing the weeds poking up out of the cracks between my patio pavers. After letting things sit for a day the weeds didn't look much different so I tried pouring small amounts of the vinegar solution on them. This did the trick and after a day my weeds were all dead. With a power wash I think that the patio will look ready for summer. I'm ready to try this on my pesky sidewalk weeds now but I think I may try adding a bit more soap and maybe some salt to see if that works better.
What tips or tricks do you have for killing weeds? Any good suggestions? I need some good ideas for spot weed killers in my lawn.