What disinfection is

Three terms that get mixed up

The practical conclusion: disinfection without cleaning first does not work. If there is a layer of dirt or grease on a surface, the product physically cannot reach what lies underneath it. That is why professional treatment is almost always two steps rather than one.

There is a fourth word you hear less often but which is useful in practice — sanitisation. It describes the whole process together: cleaning, plus disinfection, plus odour removal and an assessment of the materials if those are needed. When somebody orders “sanitary treatment of the premises”, this combination is usually what they mean, not one isolated step.

Cleaning removes what you can see. Disinfection works on what you cannot. Neither works without the other.

How it works

Disinfectants act on the cell structure of micro-organisms — damaging the cell wall, denaturing proteins or oxidising the cell contents. The detail varies with the active substance, but the practical outcome is the same: the organism loses the ability to reproduce. For the person using the product, only two parameters really matter.

These three parameters are the main difference between professional treatment and wiping a surface with a shop-bought product. The product itself often matters less than whether it was used correctly. More on that on the page about the products we use.

One more thing worth knowing: disinfection is not lasting protection. It acts on what is on the surface at the moment of treatment. As soon as somebody touches that surface, or outside air enters the room, there are micro-organisms on it again. That is not a flaw — it is the nature of the method. Which is why meaningful disinfection is always tied to a specific reason rather than to a calendar.

Why a dirty surface cannot be treated

This point matters enough to deserve its own section. On a surface that is not washed regularly — bathroom grout, a sink trap, the greasy zone of a kitchen — micro-organisms do not sit there separately. They form a dense layer covered by slime they produce themselves. That layer acts as a physical barrier: the disinfectant cannot dissolve it and never reaches the layers below.

The practical consequence is that treating a dirty surface produces a feeling of satisfaction but no result. The surface smells of the product, looks exactly as it did before, and within a few days the problem is back. People conclude that the product was weak and buy a stronger one. A stronger product does just as little against the same barrier.

Disinfection in the DDD context

The abbreviation DDD is used a lot in Latvia. It covers three separate services that are often confused:

• Disinfection — against micro-organisms: bacteria, viruses, fungi. This is what we do.
• Disinsection — against insects.
• Deratisation — against rodents.

A simple rule for telling them apart: if what is being treated is visible to the naked eye and moves, it is not disinfection. Disinfection deals with what you cannot see without a microscope.

More on the differences and where to turn in each case: what DDD means.

What it means in practice

When we talk about disinfecting premises, in practice it means one of three things:

• Treating contact surfaces — the things people touch: door handles, switches, taps, handrails, table tops, appliance buttons. Quick work with a clear target.
• Treating the whole space — fogging or ozone treatment, when everything has to be covered, including what is hard to reach: gaps, textiles, ventilation grilles, the space behind furniture.
• Treating a specific problem — mould, an odour, contamination after an incident. There the treatment is only one part of the job, and removing the cause matters more than the treatment itself.

A concrete example of what that looks like. A 65 m² two-room flat in Purvciems after a change of tenants: contact surfaces treated throughout, separate sanitary treatment of the bathroom and toilet, traps flushed out, and ozone treatment against a smell that had soaked into the wallpaper and the wardrobes. That is three different jobs in one visit, and none of them replaces the others.

When disinfection is not needed

Most sites in this industry leave this part out. In an ordinary household, preventive disinfection with no specific reason gives no practical benefit — regular cleanliness, dry surfaces and working ventilation are enough. Disinfection is a tool for a specific situation, not a daily routine.

• A small, freshly appeared patch on a smooth tile or a window frame — you can clean that off yourself.
• A smell from a dried-out trap in a rarely used shower or floor drain — pour in water and wait a day.
• Condensation on windows in winter — that is a humidity and ventilation question, not a microbiological one.
• “Just to be safe” after ordinary renovation work, if there has been no damp or waste water.

If your situation is on that list, we say so on the phone and do not book a visit. We have described the borderline cases in more detail on the page doing it yourself or calling a specialist.