Whenever any of such public Baths, Bathing Places, Wash-houses, or Drying Grounds are deemed by the Commissioners to-be unnecessary or too expensive to be kept up, the Commissioners may, by special Order as herein defined, but not otherwise, discontinue the same, and sell the Lands, Buildings, and Materials for the best Price that can reasonably be obtained, and convey the same accordingly ; and the Purchase Money shall be paid to the Treasurer of the Commissioners, and be disposed of as the Commissioners direct.