Keep after those weeds!

Knock down carpets of smaller ones with a hoe and make sure it's sharp, and it will do an impressive job. Otherwise, hand-pull individual ones. You can use boiling water on those stubborn ones between the cracks of your sidewalk. I have also zapped weeds in the cracks by filling a spray botle with white vinegar and a few drops of dish soap and hit the weeds. Just be sure that you do not hit grass or flowers. If the weeds isn't dead in a day, spray it again and that should do it in.