Washing dreadlocks that are thicker should take more time. The thickness can cause the debris and perspiration to go deep into the dreadlock. However the same is true for the drying time. You must allow your dreadlocks to dry thoroughly to avoid dry rot in your dreads.
Regular dreadlock washes do not remove wax from your hair. Washing dreadlocks with wax seem impossible. Click the picture on the left for wax removal.