You seem to have failed to grasp the fundamentals of modern weedkillers.
You hit the *PLANT* that you want to kill - all the best weedkillers are
*deactivated* on contact with a clay soil by adsorption. Spraying the
soil with it is just burning your money to no good end.

Regards,
Martin Brown


If you are going to spray, then
Use the correct rate,
Spray in the evening, don't spray if there is any wind or breeze,
Use a low presure so that there is less chance of spray drift.
You could use a drip or two of wqashing up liquid as a wetter to help
it stick to the foliage.