Attach the blender head only of an Osterizer or similar blender directly to each jar, and blend until smooth. The mixture should be about the consistency of mayonnaise.
Isn’t that gorgeous?! It will solidify a bit, but you can still scoop it out quite easily with a spoon or other utensil.
Use a tablespoon with each load of laundry. If you have a front-loading washer, put the detergent directly in with the clothes (not in the detergent tray)–it will begin to dissolve as soon as water enters the load.
The original recipe for this 5-Minute Laundry Detergent was from Budget101.com. They have lots of other great tutorials and resources, too!