Chlordane was the best - and is now banned. 2-4 D is widely available
I had my commercial herbicide/pesticide license for years. I had no need for it anymore so I left it expire. Forgot much of it.
I’ll never forget using atrazine to kill the grass along the driveway and it rained, killing a much wider area than I expected.
Or finding out that crappie bass were highly allergic to copper sulfate and they all went through the overflow pipe to escape it.
School of hard knocks learning.