Step 4: Add 2 gallons of tap water.
When you are ready to wash your first load, just mix it with a large spoon. I use 1/2 cup in my LG "he" washer. Yes I use it in my high efficiency washer. As far as I can tell there are no problems. Hardly any suds at all. Try using more in top loaders. Maybe 1 cup.
Others have been using a downy ball full of white vinegar as a rinse aid and fabric softener. It helps rinse out any soap residue. I use it in my "he" washer in the tray to the full mark.
If you are wondering if the clothes have a vinegar smell, they don't. While we're on the subject of vinegar, it works awesome as a rinse aid in your dishwasher!