There are several processes used to explain the removal of dirts or contaminants from surface, but the general name is called Cleaning
Cleaning is an umbrella name that involves the removal of visible soils mater from surfaces, there are other types of cleaning that involves the removal of non-visible matter from surface too e.g sterilisation.
Sterilisation refers to specific action taken to reduce the hazard posed by such contaminants, as opposed to general cleaning.
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Answer:
There are air filters to purify the air and water filters to clean the water. Well, the kidneys are like a filtering system, too. They contain nephrons, which filter waste from the blood in two stages. First, nephrons take waste as well as needed materials out of blood. Then, the materials the body needs (like water and glucose) are returned to the blood and wastes are eliminated from the body. This is one way the kidneys maintain homeostasis. The kidneys also regulate the amount of water in the body. The amount of water the kidneys return to the blood depends on the conditions inside and outside of the body. This is another way the excretory system maintains homeostasis. For example, you will make more urine on a cool day when you have drunk a lot of water than you will on a hot day when you've hardly had anything to drink.
(I answered a question similar to this some time ago so you might also find it there.) Hope It Helps!
Hormones
Neuroendocrine cells are like nerve cells, but they also make hormone like cells of the endocrine system. They receive messages from the nervous system and respond by making and releasing hormones. These hormones control many bodily functions.
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Being Exposed to Radiation. Also, being exposed to harmful Toxins.
