In the process of the restoration of cultural relics, the first job is to clean the objects. Although currently used methods are effective, they can be polluting, resulting in damage to the human body and to the environment. Finding new cleaning materials and methods is very important for developing sustainable methods for the conservation of relics. The use of dry ice for cleaning cultural relics is the focus of this article. As an experiment, dry ice loaded in an industrial washing machine was used to clean a late Qing Dynasty porcelain object with a thick glaze layer. The results were evaluated. This work showed that dry ice can quickly remove epoxy resin on the porcelain surface without damaging the glaze layer. The whole cleaning process is very environmentally friendly. It produces no pollution and only clean stains without creating any side products. Although the process did not clean epoxy resin laid deep under the surface, this problem could be solved with the development and optimization of the process. Eventually, dry ice cleaning might be an environmental friendly method for cleaning of relics.