With a few simple ingredients, you can make your own semi-liquid washing detergent, sometimes referred to as washing slime because of its viscous consistency. The cost will vary depending on where you live, but Trent Hamm of The Simple Dollar found that he could make laundry slime for about 3 cents a load, compared with 30 cents a load for a name-brand detergent.
Grate the bar of soap into the saucepan. The original slime recipe calls for Fels Naptha soap, but this can be difficult to find. You also can use Zote, which you may find alongside the laundry detergent in the grocery store. If you can't find either of these, use regular bath soap.
Add four cups of water to the saucepan and heat over medium-high heat, stirring until the soap dissolves.
Add three gallons of hot tap water to the five-gallon bucket. Add the soapy water to the water in the bucket. Stir to mix thoroughly.
Add the washing soda and borax. You can find these items in the laundry detergent aisle. Arm and Hammer makes the washing soda, but it is not the same thing as baking soda.
Stir well and set aside to cool. In a few hours, the mixture will set up into a gelatinous slime.
Add 1/2 to 1 cup of laundry slime to each load of laundry. If you have hard water or heavily soiled clothes, you'll need the whole cup, but it you have soft water or lightly soiled clothes, 1/2 cup should do. Experiment and see what works for your clothes.