In a dream, dust signifies money.
Seeing a cloud of dust in a dream means a mysterious happening no one knows how to get out of it. Washing one’s hands from dust in a dream means becoming poor. Dust that accumulates after a rainstorm or a thunderstorm and lightning in a dream means drought or adversities.
A cloud of dust which is produced from a brisk movement of a car or a horse in a dream means controlling one’s affairs, indulging in falsehood or enticing trouble. Dusting one’s store and throwing the dirt on the sidewalk in a dream means business losses.
If a merchant sees his merchandises covered with dust in a dream, it means depression and unsalability of his merchandise.
(Also see Specs of dust)