I used to use Sodium Chlorate to kill weeds on my drive, but as you can't buy it any more, what is a good (and cheap) alternative? The various weedkillers in the garden centre seem to be about £20 for 5 litres. I have a big drive with lots of weeds (and not much money).
And before you suggest it, pulling them out is not an option (drive is too big and too many weeds).
Need something quite potent as they are thistles, moss, grass and dandelions.
Thanks

