There are are not stains or visible dirty. Examples: summer and gym clothes (used for a short time) shirts, t-shirts toilets and sheets (used only for a day).
Normally soiled: Visible dirty and stains. Examples t-shirts and shirts (used for more than one time) linen (worn for a day) toilets and sheets (udes for one week).
Heavily soiled: Visible dirty and various stains. Examples: kitchen linen, tablecloths, working clothes, football clothes (grass stains), etc.