The following information from the Center for Disease Control and Prevention (CDC, Source) provides recommendations for the cleaning and disinfection of rooms or similar areas, after an employee, customer or visitor learns they were infected with Covid-19 while in the business. A complete list of these recommendations and similar information can be found on the CDC website.

Things that are known currently about Covid-19

• It is spread from person-to-person and happens most frequently among close contacts (within about 6 feet).
• This type of transmission occurs via respiratory droplets.
• Transmission of coronavirus to persons from contaminated surfaces with the virus has not been documented.
• Transmission of coronavirus in general occurs much more commonly through respiratory droplets than through fomites.
• Current evidence suggests that novel coronavirus may remain viable for hours to days on surfaces made from a variety of materials.
• Cleaning of visibly dirty surfaces followed by disinfection is a best practice measure for prevention of Covid-19

These guidelines are focused on businesses. They are not meant  for the cleaning staff in healthcare facilities, households, or for others for whom specific guidance already exists.

Definitions

• Community facilities (e.g., schools, daycares centers, businesses) comprise the most non-healthcare settings that are visited by the general public.
• Cleaning refers to the removal of dirt and impurities, including germs, from surfaces. Cleaning alone does not kill germs. But by removing the germs, it decreases their number and therefore any risk of spreading infection.
• Disinfecting works by using chemicals to kill germs on surfaces. This process does not necessarily clean dirty surfaces or remove germs. But killing germs remaining on a surface after cleaning further reduces any risk of spreading infection.

Cleaning and Disinfection After it is Discovered that Someone with Covid-19 Has Been in the Office

Timing and location of cleaning and disinfection of surfaces

• At a business that does not house people overnight:
  • It is recommended to close off areas used by the ill persons and wait as long as practical before beginning cleaning and disinfection to minimize potential for exposure to respiratory droplets. Open outside doors and windows to increase air circulation in the area. If possible, wait up to 24 hours before beginning cleaning and disinfection.
  • Cleaning staff should clean and disinfect all areas (e.g., offices, bathrooms, and common areas) used by the ill persons, focusing especially on frequently touched surfaces.
• At a facility that houses people overnight:
  • Follow Interim Guidance for US Institutions of Higher Education on working with state and local health officials to isolate ill persons and provide temporary housing as needed.
  • It is recommended to close off areas used by the ill persons and wait as long as practical before beginning cleaning and disinfection to minimize the potential for exposure to respiratory droplets. Open outside doors and windows to increase air circulation in the area. If possible, wait up to 24 hours before beginning cleaning and disinfection.
  • In areas where ill persons are being housed in isolation, follow Interim Guidance for Environmental Cleaning and Disinfection for U.S. Households with Suspected or Confirmed Coronavirus Disease 2019. This includes focusing on cleaning and disinfecting common areas where staff/others providing services may come into contact with ill persons, but reducing cleaning and disinfection of bedrooms/bathrooms used by ill persons to as needed.
  • In areas where ill persons have visited or used, continue routine cleaning and disinfection as in this guidance.

How to Clean and Disinfect

Surfaces

• If surfaces are dirty, they should be cleaned using a detergent or soap and water prior to disinfection.
• For disinfection, diluted household bleach solutions, alcohol solutions with at least 70% alcohol, and most common EPA-registered household disinfectants should be effective.
  • Diluted household bleach solutions can be used if appropriate for the surface. Follow the manufacturer’s instructions for application and proper ventilation. Check to ensure the product is not past its expiration date. Never mix household bleach with ammonia or any other cleanser. Unexpired household bleach will be effective against coronaviruses when properly diluted.
• Prepare a bleach solution by mixing:
  • 5 tablespoons (1/3^rd cup) bleach per gallon of water or
  • 4 teaspoons bleach per quart of water
  • Products with EPA-approved emerging viral pathogens claimspdf iconexternal icon are expected to be effective against COVID-19 based on data for harder to kill viruses. Follow the manufacturer’s instructions for all cleaning and disinfection products (e.g., concentration, application method and contact time, etc.).
  • For soft (porous) surfaces such as carpeted floor, rugs, and drapes, remove visible contamination if present and clean with appropriate cleaners indicated for use on these surfaces. After cleaning:
  • If the items can be laundered, launder items in accordance with the manufacturer’s instructions using the warmest appropriate water setting for the items and then dry items completely.
  • Otherwise, use products with the EPA-approved emerging viral pathogens claims (examples at this linkpdf iconexternal icon) that are suitable for porous surfaces

Linens, Clothing, and Other Items That Go in the Laundry

• Do not shake dirty laundry. Shaking the laundry will disperse the virus.
• Wash items in accordance with the manufacturer’s instructions. If possible, launder items using the warmest appropriate water setting for the items and dry items completely. Dirty laundry that has been in contact with an ill person can be washed with other people’s items.
• Clean and disinfect hampers or other carts for transporting laundry according to guidance above for hard or soft surfaces.

Personal Protective Equipment (PPE) and Hand Hygiene:

• Cleaning staff should wear disposable gloves and gowns for all tasks in the cleaning process, including handling trash.
  • Gloves and gowns should be compatible with the disinfectant products being used.
  • Gloves and gowns should be removed carefully to avoid contamination of the wearer and the surrounding area. Be sure to clean hands after removing gloves..
• Cleaning staff and others should clean hands often, including immediately after removing gloves and after contact with an ill person, by washing hands with soap and water for 20 seconds. If soap and water are not available and hands are not visibly dirty, an alcohol-based hand sanitizer that contains 60%-95% alcohol may be used. However, if hands are visibly dirty, always wash hands with soap and water.
• Follow normal preventive actions while at work and home, including cleaning hands and avoiding touching eyes, nose, or mouth with unwashed hands.
  • Additional key times to clean hands include:
    • After blowing one’s nose, coughing, or sneezing
    • After using the restroom
    • Before eating or preparing food
    • After contact with animals or pets
    • Before and after providing routine care for another person who needs assistance (e.g., a child)

Additional Considerations for Employers:

• Employers should work with their local and state health departments to ensure appropriate local protocols and guidelines, such as updated/additional guidance for cleaning and disinfection, are followed, including for identification of new potential cases of COVID-19.
• Employers should educate staff and workers performing cleaning, laundry, and trash pick-up activities to recognize the symptoms of Covid-19 and provide instructions on what to do if they develop symptoms within 14 days after their last possible exposure to the virus. At a minimum, any staff should immediately notify their supervisor and the local health department if they develop symptoms of Covid-19. The health department will provide guidance on what actions need to be taken. When working with your local health department check their available hours.
• Employers should develop policies for worker protection and provide training to all cleaning staff on site prior to providing cleaning tasks. Training should include when to use PPE, what PPE is necessary, how to properly don (put on), use, and doff (take off) PPE, and how to properly dispose of PPE.
• Employers must ensure workers are trained on the hazards of the cleaning chemicals used in the workplace in accordance with OSHA’s Hazard Communication standard (29 CFR 1910.1200external icon).
• Employers must comply with OSHA’s standards on Bloodborne Pathogens (29 CFR 1910.1030external icon), including proper disposal of regulated waste, and PPE (29 CFR 1910.132external icon).