In 2019, thousands of women took to the streets in Mexico City to protest gender-based violence. The demonstrations were characterised by the defacement of iconic monuments, which was widely condemned. But the protests also ignited widespread political mobilisation, including by a group of women restorers who, despite being designated to clean the monuments, refused to perform their work and publicly defended the protesters. By withholding their labour and their ostensible duty to the state and to the nation, the restorers’ actions helped to transform narratives around feminism, protest and the meaning of national heritage. Based on a case study of this previously depoliticised group of art restorers who went on to become one of the most important faces of Mexico's feminist movement, this article argues that political mobilisation can be rooted in and directly linked to people's labour and professional expertise.