Sometimes I just strim the weeds with my strimmer. I don't believe in using weedkillers because they are harmful to the environment and give you Cancer. I was once in a local farm coop and a man came in asking for weedkiller to apply to the weeds growing amongst his potatoes.
I also think it looks awful where weedkiller has been applied and there's a giant like wee stain for weeks and then the weeds still grow back.
I loved it in Detectorists when Andy was working for a temping agency and he just sprayed the weeds on the verges with WATER.
I used my trusty Azada which I believe is the Spanish word for a hoe with a flat blade and long handle.