If it kills weeds or bugs, you probably should not have it anywhere near you. It probably shouldn’t be within ten miles of a growing child or flowing surface waters.
The things we call pests are very very difficult to kill, or they wouldn’t be pestiferous.
Personally, I control invasive weeds with a propane flamethrower. If I could get one that didn’t use fossil fuels, I would. Fire is cleansing.
If I could go back in time and murder Paracelsus before his stupid aphorism became a meme, I would.
