A colostomy bag having a cleansing system wherein the bag is cleaned while in its operable position associated with the person. More specifically, the system mounts a manifold within the colostomy bag with an access to water under pressure from outside, the manifold providing a spray dispersion of fluid, or cleansing water, at the top of the bag and gravity then drips it down through the bag and out the open bottom end, with the residue of the bag being washed out by the water and passing into a toilet. The user can thus easily flush the bag to complete cleaning with all residue from the bag passing into the toilet. A water source from the toilet itself, or other suitable water supply, provides the water under pressure to the manifold inside the top of the colostomy bag.