Background - I have been in the cleaning industry for over 42 years and operated my company The Crew Janitorial in Denver all that time... Covid-19 Question: How do I make my home or office Covid-19 free after someone tests positive? Answer: Being infected by the virus when touching surfaces that have been infected with the Covid-19 is still not fully understood. But it is universally understood that all point of contact surfaces should be thoroughly washed with soapy water.