What washing products do star hotels use to wash rags?

This rag is different from ordinary hotel linen. This is very greasy. Use degreased detergent. Other detergents are not ideal. Detergent itself is called tableware detergent, which has a strong emulsifying ability for oil and grease, and is specially used to clean oily things, and it is non-toxic and harmless.

If it is cold in winter, in addition to raising the water temperature, you can also consider adding some soda ash, that is, sodium carbonate, which is helpful to enhance the oil removal ability.