As an anti-social hermit, I'm not taking any specific steps for the issue you describe.
When I went to Elderly to try out new banjos, they had some sort of 'UV disinfecting process' that took about 20 minutes to fully sterilize the surface of their instruments after a customer handled it. Perhaps you could look into a UV system.
In the spring, I gave everyone in my band “their” singing microphones. They took them home & used the same mic when needed( 3 times since most things were canceled). When this is over I’ll put all my microphones back in my case like I’ve always done.