Cleaning

Cleaning is the systematic process of removing unwanted substances from an object or an environment. These substances are often called impurities, which include things like dirt, dust, and other contaminants. People perform cleaning for several vital reasons. It can be done for aesthetic reasons to make things look better. It is also used for hygiene to maintain health and for functional or safety purposes. In some cases, cleaning is used for environmental protection to keep our world safe.

Most cleaning methods work through two main ways: mechanical action or chemical processes. Mechanical action involves physical force to move dirt away. This includes sweeping with a brush or using a mop on a floor. Chemical processes often use solvation, which is when a liquid dissolves a substance. Many methods actually combine both actions to be more effective. For example, washing usually involves using water along with a soap or detergent to lift dirt away.

There are many specialized methods used depending on the task. Pressure washing uses a high-pressure stream of water to clean surfaces. Some advanced methods use sound waves, known as acoustic cleaning, to shake particles loose. Ultrasonic cleaning uses ultrasound, which is sound at a frequency between 20 and 400 kHz. There is even a gentler version called megasonic cleaning. This is often used for delicate items like medical implants or industrial wafers. Other methods include dry cleaning, which uses chemical solvents instead of water, and flame cleaning, which uses an oxyacetylene flame on structural steel.

Cleaning happens in many different contexts and scales. Domestic cleaning includes housekeeping and seasonal tasks like spring cleaning. In healthcare settings, workers perform terminal cleaning to ensure environments are safe. Commercial cleaning occurs in business settings. There is also environmental remediation, which is the process of removing pollution or contaminants from the natural environment.

Because different objects have different properties, many items require specialized techniques. Buildings and infrastructure need everything from roof cleaning to graffiti removal. Some tasks are very specific, such as cleaning chimneys, silos, or even streets. Cultural items require extreme care through conservation and restoration. This process involves the careful cleaning of cultural property to preserve history. Other specialized cleaning includes dental hygiene for teeth, laundry for textiles, and parts cleaning in industrial settings.

Many professional occupations are dedicated to these tasks. Dental hygienists focus on cleaning teeth to maintain oral health. Housekeepers and maids work in domestic settings, while janitors and property caretakers manage buildings. There are even specific roles like fluffers, who are responsible for cleaning tracks on the London Underground.

Cleaning is closely connected to the fields of biology and health. It is a part of hygiene, which is a set of practices used to preserve health. It is also linked to sanitation, which uses specific techniques to protect human health by providing clean environments. In microbiology, cleaning can lead to sterilization. Sterilization is the complete elimination or deactivation of biological agents. Modern technology even allows for automated cleaning, such as robotic vacuums, self-cleaning ovens, and self-cleaning glass.