Tangible cultural heritage assets constitute an invaluable and irreplaceable resource of humanity, which are increasingly threatened by contaminants from pollution, vandalism and fire. Available cleaning methods require mechanical action and solvents which can be detrimental to art materials and harmful to health and the environment. Cleaning with extremely short-lived oxygen atoms - atomic oxygen could provide a breakthrough solution. Experts from plasma physics, heritage science, and conservation from 10 European research organizations, museums, and SMEs, have joined forces in a new MOXY project, coordinated by Ghent University, which aims to develop an unprecedented green cleaning technology to remove contaminants in a non-contact manner, without health or environmental concerns.