Significant cell death xkcd by Randall Munroe (CC BY-NC) Bleach also works. And high concentrations of ethanol (works for humans too). Also, just leaving the petri dish out on your lab bench to desiccate. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on Tumblr (Opens in new window) Tumblr Share on Pinterest (Opens in new window) Pinterest Share on Reddit (Opens in new window) Reddit Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Like Loading...