a process for removing residues from the microstructure of an object is provided , which comprises steps of preparing a remover including carbon dioxide , an additive for removing the residues and a co - solvent dissolving the additive in said carbon dioxide at a pressurized fluid condition ; and bringing the object into contact with the remover so as to remove the residues from the object . a composition for removing residues from the microstructure of an object is also provided .