Be careful not to get it on anything because vinegar will harm anything it hits.

I am still in trouble from my wife over a small tree that she found growing in our backyard and transplanted to a spot she wanted it to grow in. A few years ago I was spraying crabgrass with 20% and it was my first time ever using vinegar. The wind caught some of the spray and it just barely hit the tree. Temps were in the 100's (Texas) and 2 days later that tree was dead. I tried to revive it but could not.

These days I use 10% with a teaspoon of orange oil and a teaspoon of dishsoap. 20% is just too strong and kills everything around it. 10% is still effective and I just use a squirt bottle and directly spray the weed from 6" away. The weed dies and the the grass around it quickly recovers and takes over.