Georgesgran
Online, there’s a recommendation to add salt and washing up liquid to the white vinegar before spraying.
I haven’t tried it, but I have a big block paved drive and use Pathclear in a watering can, over the whole area a couple of times a year, but I do remove the odd weed as they appear.
I had it ‘professionally’ cleaned a couple of years ago - what a mess - never again.
I use Pathclear too and find it excellent. I generally find one application a year is enough though occasionally need to do it twice.

