the present invention is an apparatus and process for cleaning substrates using dense fluids under the influence of a continuous centrifugal force . dense fluid centrifugal separations resolve many problems associated with conventional dense fluid cleaning technology . these include elimination of pooling and supercooling of liquid carbon dioxide trapped within pores and cavities of a substrate — leading to formation of dry ice and recontamination of substrate , ability to precision clean using one unit volume of dense fluid per cleaning operation and ability to remove small insoluble particles from deep voids or cavities . the present invention can perform solvent - aided separation processes heretofore not possible using conventional dense fluid technology . these include liquid - liquid , liquid - supercritical - fluid , froth flotation and centrifugal phase - shift separations . finally , the present invention embodies an alternative dense fluid centrifuge apparatus that can tilt from vertical to any angle of orientation to horizontal . this allows for a large variety of substrate cleaning and finishing applications using the dense fluid technology such as barrel finishing — deburring and cleaning in one single device and process .