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Diaquat will work but you need to check that is legal ... why would you bother the weeds will die off anyway?
Scotts Hammer thats what i use. nothing to do with the make it in the shed gang.
Glyphosate (Roundup,hammer etc) will be very slow as the plant is not "actively " growing. Diquat acts differently.https://www.rhs.org.uk/advice/pdfs/weedkiller-for-home-gardeners