Bleaching will kill everything in the soil if you want to apply enough to kill what you brought in.It will change the pH drastically and change what soil flora might repopulate soil. That's not a good idea, either. Completely sterilizing an outside soil severely upsets the natural soil balance, and whatever soil flora (good or bad) will rush in afterwards to fill the void where soil life was extinguished. More often, it's the bad things that will proliferate exponentially in the beginning and it might take more than a year for the soil ecosystem to re-balance itself. Meanwhile, you would likely find anomalies with how things grow that you won't be able to fix because no one knows what is actually happening in the soil. In my opinion, I think the best thing to do now is just let it be, and it is more likely that the natural soil flora will compete aggressively with whatever you brought in. No one can be sure, though.
I didn't mean to scare you too much about introducing foreign soil and all that comes with it. It's kinda like planting any non-native tree, vegetable or flower in your garden. In actuality, there is rarely a problem. But there is always the possibility, and multiplied by, say, 100, because there is at least a hundred different species of soil flora in a handful of soil. We all just need to be cognizant of our impacts, and I brought the subject up for the benefit of anyone who reads this, not just you, Stella.
