This paper seeks to better understand urban sustainability experimentation with reference to the bodily sensations of composting household food waste. Taking our lead from Deleuze and Guattari, we argue that experimentation is not just the result of the scientific knowledge of how to compost, but the sensations of bringing together materials, human, non-humans, and ideas into a working arrangement. We draw on Deleuze and Guattari's notion of molar, molecular and rupture lines to offer a way to envisage experimentation as an affective dimension that emerges from the opposing forces that dissolve and support bodily capacities to care for compost as working socio-material arrangements that make, remake, and unmake composting bodies and spaces. Based on a sensory composting ethnography conducted with 21 individuals of European ancestry and tertiary education in Wollongong, New South Wales, Australia, we provide two significant insights. First, we argue that implications for the bodily