Our nanny was doing a project with the kids and wound up with a bunch of baking soda/water slurry. She dumped it out on to a patch of Leptinella squalida. In a panic, we dumped a bunch of water on the patch to try to dilute it out...I think we just managed to distribute it through a larger patch of soil. I am pretty sure the plants are dead, is there anything we can do to condition the soil or do we need to dig it out and replace it? It is probably around 6 to 9 cubic feet of material affected with about a cup or so of baking soda. I attached a photo showing the extents (the tape measure is about 3ft extended, I added a yellow outline just outside the affected area) and a close up showing the dead vs live plants. Thanks!