We recommend washing your dreads about every 4 to 7 days when they are new. You can also wash them with a nylon on your head to keep them from loosening while you wash them. Using the dread soap will help them tighten up faster and leave'm supa clean without drying your scalp or causing dandruff. Hair, whether it's dreaded or not produces oil to protect itself. Every time you wash the oil away it produces more.
Most people wash their undreaded hair every day.
If they were to wash it every seven days instead, it would get a bit greasy and prolly itch a little. In a couple of weeks the hair will adjust to this new schedule of washing and produce less oil. It would no longer be oily or itchy. Dreaded hair works the same way. When your dreads are new be sure not to use real hot water cause you don't want to melt out all the wax until they have a chance to tighten up more.