This is apparently written by a surgeon working at high risk of covid-19 transmission, spraying himself and patients with a known (and safe?) virus killing agen

This is apparently written by a surgeon working at high risk of covid-19 transmission, spraying himself and patients with a known (and safe?) virus killing agent in addition to standard ppe. This sounds plausible to my layman ears (certainly not as dubious as ivermectin etc) but perhaps too-obvious-simple-good to be true. Upvoted in hopes someone knowledgeable comments.