Regular liquid dish soap can be used in place of laundry detergent. A much smaller amount of the liquid dish soap is needed for a load of laundry than the recommeneded volume for detergent.
In addition to regular everyday dish soap, there are a plethora of different substances that can be used in place of laundry detergent. Baking soda is a very popular household whitening ingredient which can be used for laundry. Adding lemon to the powder not only enhances the whitening properties of a baking soda but also leaves clothes with a good scent. Many natural alternatives like these are much healthier than using regular laundry detergent.