First of all, because of the nasty odor of these agents, most of which irritate the mucous membranes of the eyes, respiratory tract and skin, corrode metal and other surfaces and tissues, destroy and discolor them as well.
⠀⠀⠀ According to the article «Silver agents: yesterday, today and tomorrow» (Pharmaceutical Journal, 2006. No. 5, p. 45-57), Olekasandr Shcherbakov and others disclose the bactericidal and bacteriostatic effect of silver ions on known types of bacteria, their effect is 1500 times higher than concentration of phenol (C6H5OH) and in 3.5 times higher then mercuric chloride (HgCl2). They reveal the effect of colloidal solutions of silver on influenza viruses «A», «B», «Miter» and «Sendai» and describe the fungicidal action of silver against the pathogenic yeast Candida albicans and many other properties.
⠀⠀⠀ It should be noted that on March 13, 2020, the United States Environmental Protection Agency (EPA) included silver sanitizers the list of substances that can fight the SARS-CoV-2 coronavirus.