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Some say all it takes is a normal type of vinegar that you can buy in a grocery store.

At least this is safe, as it is used in cooking or cleaning.

All I'm sure about is that an limited solution of vinegar can burn the leaves of a weed and leave them withered. Some weeds resist this more than others, but I have experienced that with more effort my process can kill weeds down to the roots.

For example sheep sorrell (pictured on this page), and in my experience both reed canary grass and sedge rush have virulent rhizomes that spawn new roots and leaves. Because they are beneath the level of the plants it is difficult to affect them with an herbicide.

Even with sheep sorrel, effects of a systemic herbicide is limited.

Before

After

Two weeks after thorough spraying these sheep sorrel did not regrow from their roots. However, I believe the effect depended on saturating the soil down to the depth of the rhizomes.

I spray on weeds with a high concentration of vinegar, making sure to completely douse each and root or rhizome in the soil down to the roots.

I diluted the 50% concentration equally with water yielding a 25% strength.

However, the effect of these herbicides seem not to affect well-established rhizomes. In the case of sheepsorrell, perhaps the limited depth of the rhizomes made the concentrated vinegar solution more effective.

??Changes to soil pH??