We wash our cloth to remove dirt for next use. for that we use soaps or detergents to remove dirt. They not only remove dirt but some chemicals deposit in the small pits in cloths. the present detergents contain chemicals such as stilbenes, fluorescent such as Umbelliferone which absorb energy from UV ray of spectrum and re-emit that energy as light so it will appear like a brighter one the same chemical and technology are used in paper brightening, textile brightening etc. In sunlight it will be better to see because of light indencity and presence of UV ray in sunlight. some animals like birds, cat , dog etc have fluorescent material we could see this in their eyes during night
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