For disinfecting caps, our normal recommendation is to use Envirocide or Metricide. Cavicide is a great alternative as well. While we don’t have any test data on the precise effectiveness of these disinfectants against viruses in the Coronavirus family (such as SARS-CoV-2, aka the COVID-19 virus), we do know that they are active against enveloped viruses such as those. And the good news is that enveloped viruses (such as those in the Coronavirus family) are the easiest to kill. Normal soap kills them pretty well, so for a disinfecting agent even soap equates to “low level disinfection.”
