On a washing machine, soil level denotes the intensity of the wash cycle. It allows users to customize the wash based on the amount of dirt or staining present in the load. For example, a heavily soiled load of gardening clothes would benefit from a higher setting, extending the wash time and agitation to effectively remove ingrained dirt, while lightly worn garments might only require a lower setting.
Selecting the appropriate wash intensity optimizes cleaning performance and protects clothing. Using an unnecessarily high setting can cause premature wear and tear on delicate fabrics, whereas too low a setting may result in inadequately cleaned items. Understanding the varying degrees of dirt and their impact on fabric care became more prevalent with the advent of automatic washing machines, prompting manufacturers to incorporate adjustable wash intensity options.