The dust in dream indicates the aspects of your personality that were rejected by you. If you were covered in dusts, then such dream indicates the suffer of you will experience because of other peoples mistakes. If you are dusting something in a dream, then it shows the phase of your life where you are cleaning all of the negative aspects. You are opening the new page of your life.
Dust dream meaning
Read more about dreaming of Dust in other dream meanings interpretations.