I use a mixture of vinegar and salt. The vinegar I use is 45% acidic (very corrosive, be careful with it). This is topical, the same as Roundup. And VERY effect. Fast knock down and kills weeds dead - just be careful not to get it on plants you want, it is a non-discriminating plant killer. It kills by drying the plant so it can not absorb moisture. It is not a poison per se. and is not harmful to the environment. In addition it is very inexpensive.
You can use plain kitchen vinegar with table salt which is 5% acid, it is just a little slower, but not really any less effective.
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