Short answer
Enzyme cleaners break down the proteins, fats, and starches in blood, vomit, and other body fluids. So they help you with dried soil in stretcher parts, seat fabric, and some reusable equipment, when the maker allows it. They are cleaners, not disinfectants. A registered disinfectant must follow. Live-microbe products suit drains and odor control in your bays. They seldom belong inside a patient compartment, where you are trying to cut down on microbes.
Two very different kinds of product
In environmental work, bioremediation means using living processes to break down pollution. In emergency vehicle decontamination, or decon, people use the word more loosely. You may hear it used for two different kinds of products.
The first kind is enzyme cleaners. Enzymes are natural substances that break things down. These cleaners usually hold proteases for proteins, lipases for fats, and amylases for starches. They break organic soil into smaller pieces that rinse or wipe away more easily. The enzymes themselves are not alive.
The second kind is microbial or bio-based products. These hold live, helpful bacteria, often as spores, which are a resting form. The bacteria eat organic residue over time. You will see these products used for drain care, grease traps, and odor control.
The two are very different. They fit very different parts of your program. Mixing them up is where problems start.
Enzymes: where they help, and why they are never the last step
Blood and many other body fluids are rich in protein. When they dry, most of all in grooves, tracks, and fabric, those proteins grip surfaces tightly. Plain detergent and scrubbing can struggle to remove them. And a disinfectant put on top of dried protein may not reach the germs under it.
Enzyme cleaners are made for this very problem. Given enough time to sit, they loosen protein soil so it can be wiped, brushed, or pulled out. That gets the surface ready for disinfecting.
The amount of germs found in ambulances makes careful soil removal worth your time. In a 2011 surveillance study of metropolitan ambulances by Noh and colleagues, 214 of 429 samples grew bacteria. Much of what builds up on surfaces is organic residue that shields microbes. Removing it is the step that makes the rest of the process work.
Enzyme cleaners are not disinfectants. They break down soil. They do not reliably kill bacteria, viruses, or fungi. After an enzyme step, your surfaces still need a registered disinfectant. Apply it as its label directs, and keep it wet for the full time the label gives.
The order matters. Many disinfectants will stop enzymes from working. Some enzyme residue can get in the way of certain disinfectants. The usual order has four steps. Apply the enzyme cleaner. Let it sit for the recommended time. Remove the loosened soil and residue by wiping or rinsing. Only then disinfect. Follow both product labels.
Heat and time also affect how well enzymes work. They usually work best within a certain temperature range, and they need a few minutes to act. If you spray an enzyme cleaner and wipe it off at once, you waste the product and leave soil behind.
- Dried blood in stretcher rails, locks, and wheel assemblies
- Soiled seat fabric and cloth seatbelts in the cab or on the bench
- Floor seams, track edges, and textured flooring where residue collects
- Vomit residue in hard-to-reach gaps around seats and cabinets
- Reusable medical devices, only when the device maker's instructions call for an enzyme detergent
Live-microbe products belong outside the compartment
Live-microbe products generally do not belong in your patient compartment. Inside an ambulance, the goal is to remove soil and cut down the microbes on surfaces that patients and crews touch. Adding live bacteria on purpose, even helpful ones, works against that goal. You would find it hard to defend to an infection control officer or medical director.
Live-microbe products also tend to work slowly, over hours or days. That does not fit how fast an emergency vehicle must return to service. And the disinfectant you use afterward would kill the microbes anyway. That makes the product pointless.
Microbial products can make sense outside the vehicle. They suit station floor drains, trench drains, and grease or oil separators, where organic buildup causes odors and clogs. Even there, check with your facilities team and wastewater utility. Some systems limit what may be added.
Odors and interior materials
Odors in your vehicles often come from organic residue that was not fully removed. It may be vomit in a seat seam, urine in a floor channel, or blood in a stretcher mattress seam. Cover-up products hide the smell for a short while. It comes back when the residue is still there.
Enzyme cleaners can break down the source of the odor so it can be removed. This helps most in patrol car rear seats and in cabs with fabric seats, where odors can hang on for days.
An odor may keep coming back after enzyme treatment and disinfection. If so, the residue may have soaked into the padding or foam under a torn cover. At that point, replacing the part usually works better than cleaning again and again.
Do not reach for fragrances or ozone machines as a shortcut. Fragrance hides the problem from your crew while the residue stays. Ozone brings its own safety and material concerns in a closed compartment. Finding and removing the source is slower, but it lasts.
Most enzyme cleaners are fairly gentle next to strong oxidizers or solvents. But they are not safe for every surface. Some can leave a residue that attracts dirt. Some are not recommended for electronics or certain coated surfaces.
Check which surfaces the product is safe for. Check any guidance from the makers of your equipment and vehicles. For heart monitors, ventilators, and other electronics, use only products the device maker approves. Test on a small, hidden patch of fabric or vinyl before you treat a whole seat.
Rinse or wipe away enzyme residue before you disinfect. This protects how well the disinfectant works. It also avoids sticky films that collect new soil.
Worked illustration: dried blood in a stretcher mechanism
As an illustration, take a private ambulance company. One of its units comes back from a long transfer between hospitals. The crew was busy with the patient the whole way. A small amount of blood dripped into the part of the stretcher that raises and lowers it. By the time the unit reaches the station, the blood has dried in the grooves.
The fleet technician takes the stretcher out of the unit and sets it in the station's equipment cleaning area. He puts on proper protective gear. He applies an enzyme cleaner that the stretcher's maker approves. He lets it sit for the time on the label.
He then uses a soft brush to work the loosened residue free. He wipes the area clean with a damp cloth, then a dry one. Once the soil he can see is gone, he applies the company's registered disinfectant. He keeps the surfaces wet for the full time the label requires.
He checks the work under a bright light. Then he oils the mechanism as the maker's instructions direct, since cleaning products can strip away lubricant. The stretcher goes back in the unit. The technician logs the cleaning and the products used.
Deciding when to use enzymes, and what to ask vendors
Most fleets do not need an enzyme step after every call. Cleaning between calls usually deals with fresh soil on hard, smooth surfaces. There, a detergent or a one-step cleaner-disinfectant used as its label directs is usually enough. An enzyme step on every turnaround would slow your units down for little gain.
Enzymes earn their place in three cases. The first is heavy protein soil that has been left to dry, such as blood in a mechanism during a long transport. The second is soft, absorbent, or textured material, where soil settles deep. That includes fabric seats, cloth belts, and grooved flooring. The third is the scheduled deep clean. Then your units come out of service for a top-to-bottom decon, and technicians have time to let products sit properly.
Write these triggers into your cleaning procedure. That keeps enzyme products from being overused on routine cleans or forgotten when you truly need them. It also helps with buying. You can estimate how much you will use from how often deep cleans and heavy-soil events happen.
Training should cover the why, not just the how. Crews who know that enzymes loosen soil but do not disinfect are less likely to skip the disinfectant afterward. They are also less likely to think an enzyme spray alone has made a unit ready for the next patient.
Storage matters as well. Enzyme products can weaken if they overheat or freeze. Ambulance compartments and unheated station storerooms see both. Keep your stock where the temperature is controlled. Rotate it, and note the expiration dates.
Sales material for these products can blur important differences. Clear questions will help you understand what you are buying and whether it fits your program.
Be careful with any product that claims to clean and disinfect in one step through enzymes or microbes alone. Be just as careful with one that promises to wipe out all germs. Look closely at the label and the evidence behind such claims.
- Is this an enzyme cleaner, a live-microbe product, or something else?
- Is it meant as a cleaner only, or does it carry any registered disinfectant claims?
- How long must it sit, and at what temperature, to work?
- How should it be removed before a disinfectant goes on?
- Is it safe for the vinyl, plastics, stretcher parts, and electronics in our units?
- Have equipment makers approved it for their devices?
