The detergent products of the old housekeeper's washing machine need to be soaked in warm water for a long time to achieve the best effect. When the water temperature is 40 to 50 degrees, the effect of directly soaking items in cold water will be weakened.

Cleaning the washing machine requires cleaning agent from the old housekeeper. The effect of warm water is much better than that of cold water, so it needs to be supplemented with water.