During this current pandemic I have seen videos of people performing the task shown in the picture. This may look effective. Has he cleaned? How long will the chemical dwell? Will he rinse after the chemical dries? What has he left behind when the chemical dries and is not rinsed? It is the biofilm. If you have never heard of biofilm let me explain why this may be aiding the spread of this deadly virus. Biofilm is the almost invisible residue left behind when cleaners and disinfectants dry. The residue contains the microscopic solids in the disinfectant’s formula. The microscopic solids in the biofilm become a food source allowing microbes to feed. Then they secrete a slimy substance that forms a barrier. It eventually hardens. Biofilms build up due to repeated applications without rinsing. Biofilms can hold billions and billions of microbes. “Studies have shown microbes can survive in their biofilm for 20 minutes under pure disinfectant. There is evidence biofilms have grown in disinfecting concentrations of quaternary disinfecting solutions. Cleaning with surfactant-based detergents / disinfectants deposits organic residues which some bacteria are able to metabolize as a nutrient source (food) for growth in biofilms. Bacterial populations found in health care environments are many times more resistant to antibiotics and surface disinfectants than the ATCC (American Type Culture Collection) strains used for testing disinfectants.” —
Medscape 2014

When someone touches biofilm containing bacteria and viruses they attach to the person and are easily transferred to whatever that person touches. I spent 43+ years teaching and coaching custodians how to clean everything in a building. At home we buy name brand disinfectant sprays. Have you read the label instructions? It tells you to clean, disinfect and rinse. But it does not tell how long to let the product stay wet. So again, we are sanitizing, not disinfecting. To this day when I ask students in my OSHA classes, how many ounces are in a gallon, about 20 % get it right. The most consistent answer is 64 ounces. That is actually half a gallon. In the commercial cleaning industry disinfectants are concentrated. The formulas for mixing with water vary starting with, 1:64 (2 ounces per gallon of water). The second example is 1:128 (1 ounce per gallon). The third example is 1:264 (1/2 ounce per gallon). How can you measure 1/2 ounce properly? I would ask my students to pour 2 ounces into a large bowl and then pour it into a measuring cup. I have actually seen some pour as much as 8 ounces into the bowl. Imagine what that would do. At that
concentration, the amount of biofilm residue would be quite visible. If you rubbed your hand you would get a white substance on your hand. Remember those solids? During the mid-1980’s the cleaning industry developed chemical
dispensing systems. These were built with concentrated chemicals and tubes connected to various types of dispensers with tiny metering tips to properly measure the 1:64, 1:128 or 1:264. Solids (active ingredients) in the disinfectant build up inside the dispenser’s tips over a period of time. When these tips slightly clog it closes the opening enough to change the formula. Custodians don’t know when this is occurring. Incorrect measuring alters the disinfectant. Now the disinfectant is not being applied at the proper dilution. It is less effective and unable to kill the bacteria and viruses. Routine cleaning and disinfection practices described above are not effective at removing biofilms. Why? The biofilm needs to be agitated in order to break its bond to the surface and totally remove it. This cannot happen when disinfectants are sprayed or wiped. New cleaning and disinfecting processes are available to prevent the accumulation of organic soils and bacteria on frequently cleaned surfaces. I am quite familiar with the most effective system to accomplish total disinfection in one easy step. Total disinfection is accomplished on every surface (even vertical) in seven seconds or less with one company’s steam vapor system. The steam is applied, all the while agitating the surface achieving total disinfection. Liquid disinfection systems currently used are slow and ineffective. The modern and most effective way to disinfect is with steam vapor. The friend of COVID-19 is biofilm. If we remove the biofilm containing the COVID-19 virus we should reduce the number of deadly cases we hear about on the news all day long.
Kerry W Rigg — Cleaning industry consultant, Authorized OSHA
Outreach Trainer and Author


Are Advanced Vapor Technologies products effective against SARS CoV-2?

Currently, there are no available test strains of SARS-CoV-2, the cause of COVID-19. That said, products that have been tested and proven effective on either a harder-to-kill virus, such as canine parvovirus, or a similar human coronavirus, such as coronavirus 229E, are expected to be effective according to the U.S. Environmental Protection Agency (EPA).  MondoVap2400® dry vapor systems equipped with TANCS® (EPA Est. No. 82121-WA-01) which satisfy both requirements: 
Human coronavirus 229E (≥99.94% reduction in 3 seconds)
Harder-to-kill viruses, such as canine parvovirus (≥99.99% reduction in 7 seconds)
Two Nationally recognized laboratories performed tests on the efficacy of the TANCS® dry steam vapor system in killing microbes. Their results supported the TANCS® dry steam vapor ability to perform disinfecting. Four nationally known universities did Peer Reviews which supported the laboratories results in disinfecting better and faster than Chemicals.


Contact Time


Human Coronavirus 229 E 3 Seconds

99.94% Reduction

Norovirus (Feline Calicivirus) 7 Seconds

99.99% Reduction

Canine Parvovirus 7 Seconds

99.99% Reduction

Avian Influenza (Bird Flu) 7 Seconds

99.99% Reduction

MS2 Virus (Non-enveloped "Indicator" Virus) 2 Seconds

99.99% Reduction