Pathclear, probably the best, although you'll have limited success now, as the stuff works best in sunny weather, and while the plants are still growing well. Phil

yep I'd go with Pathclear too.

Don't get a spray one - use a watering can, and make sure you mark it and use it just for weedkiller. Mine for my cobbles is a red can, and I painted 'W.K' on each side of it to be sure I don't use it for anything else.

I use salt, neat or mixed in water on a dry day

Depending on what weeds you have? On 4 paths and 2 patios and some railway sleepers I use Armillatox a soap based solution it kills moss and lichen and leaves areas non slip which is great on my sleepers. The only drawback is its strong smell.