Pre-washing is a type of washing that is generally used to clean clothes with difficult stains. It is especially preferred for whites. However, it is not considered environmentally friendly due to its high temperature and long washing time, and it is a washing type that has recently been abandoned. You can pre-wash cotton fabrics. However, there is a risk of shrinkage of 100% cotton fabrics. You can wash polyester fabrics in the prewash program. When choosing the prewash program, you can also determine the temperature at which the laundry will be washed. If you choose the prewash program at 60 degrees instead of 90 degrees, you can ensure that your laundry is less damaged.