there's always Granular Chlorine, which you can still buy at a pool supply, and many other places.. if it's alive, Chlorine will kill it!.. it destroys DNA, but it's very safe, if common sense is used. it also dissipates in a couple of days in soil..
We were probably typing at the same time. Not sure if you saw my reply. I addressed granular chlorine. Sounds good but I didn't have a chance to try it. I appreciate the suggestion. I would say "maybe next time" but I don't want to ever do this again.