Chapter 3 undertakes a comparative study of three deodorization projects in Shanghai, conducted respectively by Western colonial administrations from the 1850s to the 1890s, reform-minded Chinese gentry of the late Qing and early Republic, and the Communists in the 1950s, with a focus on the trope of stagnant water. Despite their disparate, if not antithetic, motives and rhetoric, these projects forged a continuous Chinese olfactory revolution through a common commitment to the progressive ideology of deodorization. I scrutinize how the threads of olfactory modernity tied in with a series of spatializing projects during the urbanization of Shanghai, and how these undertakings brought about an uneven redistribution of sensescapes alongside capital and symbolic capital. I argue that the outcome of battling against contamination was not purity, but a stratified reorganization of purified and contaminated spaces.