The Dust and Filth which the Commissioners shall cause to he collected from the Streets, Privies, Sewers, and Cesspools, and all the Dust, Ashes, and Rubbish which the Commissioners shall cause to be collected and carried away from the Houses or elsewhere within the said Limits, shall be the Property of the Commissioners, and the Commissioners shall have Power to sell and dispose of the same as they think proper, and the Money arising from the Sale thereof shall be applied toward the Purposes of the special Act.