Why Your Carpets Can Smell Even When Cleaned.
It is a little known fact that even when a carpet looks clean and has not been recently dirty, it can be harboring smells, bacteria and moisture deep within the fibres.
A carpet can be viewed as a geological cross-section. The pile on the surface of the carpet is made up of the fibres that you can see and feel when you are walking on the carpet. These are the parts that get vacuumed. Beneath the pile is the primary backing of the carpet. Beneath that is the adhesive that holds the primary backing to the secondary backing. Beneath the secondary backing is the underlay. The underlay sits on the subfloor of a property. All of these layers can contain moisture and biological matter. When something is spilled on a carpet, whether it be a liquid or a solid, it can work its way down through all of the layers of the carpet. A surface spray or even a vacuum cleaner will struggle to reach down into the carpet to clean these areas.
The type of fibres found in your carpet also have an impact on the amount of smells that your carpet can hold. Wool fibres are naturally very porous which allows for the absorption of any smells or odours that come into contact with the carpet. The porous nature of wool fibres also gives them their warmth and cushioning. However, the smells that have been absorbed into the fibres can be released back into the air as humidity levels increase. Synthetic fibres, such as nylon and polyester, are less able to absorb smells than wool fibres. However, they can still hold a lot of smells as the fibres have a static charge, which attracts and holds fine particles such as dust and dirt. In particular, the smells of pet urine can be particularly difficult to remove from carpets as the uric acid in the urine crystals form a strong chemical bond with the fibres in the carpet. These crystals can then reactivate when the carpet is exposed to damp conditions and cause the carpet to smell once again. If you are looking for Carpet Cleaning Hereford, see https://octokleen.co.uk/.
Research has also found that carpets act as a reservoir for matter which normal cleaning will rarely remove. Dust mites, human skin cells, and other biological matter can be found in carpets long after they have stopped performing their function on the floor. There is a useful background explanation of how indoor allergens accumulate in soft furnishings.
Carpet cleaning is slightly different from many other areas due to the high levels of dampness throughout the year and the high levels of moisture within the underlay that this creates. As a result there is a higher instance of mould and bacteria within the carpet than in many other locations. This in turn creates deeper and more persistent odours.
Hot water extraction (also known as steam cleaning) is the only method capable of reaching deeper layers of carpet, such as the backing, to remove a wide variety of dirt including odour-causing particles. For surface dirt, and for the ongoing cleaning of carpets between deep cleanings, a dry compound is generally better.