The cleaning of household linens is done as appropriate to the type of cloth. Household linens are most likely to have stains from organic sources such as food, blood, and soil. If the linens are made of natural fibres such as linen or cotton, the cloth will need to be rinsed in cold water as soon as possible to prevent the stain from becoming permanent. Stains from red wine, or red or purple berries and fruit are an exception and must be washed in boiling water. Despite this, these stains may be impossible to remove. Otherwise, regular washing of household linens should be done in hot water for
hygienic reasons, to destroy
bacteria from frequent use. Linen and cotton that are white may also become yellow over time. This is eliminated with liquid
bleach, or by the traditional method of hanging the linens in the sun to let the sunlight bleach out the discoloration.
Industrial cleaning of linens Industrial laundries were developed in the Middle Ages, when large convents and monasteries used their own facilities. Hospitals and boarding schools followed this example. Today, there are several types of industrial laundries. Hospitals often use laundry chutes to collect used linens. These are transported to an industrial laundry, where they are sorted into three categories: regularly soiled, infected, or staff uniforms. They are laundered as appropriate, usually at high temperatures, to ensure that viruses, bacteria, and soil are cleaned and that the linens are hygienic before being returned to the hospital. In India,
Dhobi ghats provide laundry service to both institutions and households. Household linens and clothing are both collected on a fixed day of the week by the Dhobi, who washes the laundry at a ghat, which is often in a large Dhobi ghat zone where many Dhobis work at their own stall. Each stall is approximately four square metres. Laundry is washed in large tubs, rinsed, cleaned by beating on a stone made for the purpose, then the linens are hung on lines to dry. Industrial linens are treated in steamers for several hours for hygienic reasons. Dhobis also iron linens. ==Antique linens==