Liquid/supercritical carbon dioxide dry cleaning system

An apparatus for cleaning a substrate with a densified gas comprising:

• a sealable cleaning vessel defining a compartment with temperature change means operatively associated therewith for adjusting the temperature within said compartment;
• a rotatable drum adapted to receive the substrate, the drum being positionable inside the cleaning vessel compartment, the substrate being selectably in contact with densified first gas when within the compartment;
• a storage vessel in fluid communication with the compartment;
• a gas vaporizer vessel in fluid communication with the compartment, wherein the storage vessel is in fluid communication with the ga vaporizer vessel by first conduit means;
• and
• means for introducing a compressed second gas at a selected pressure into said compartment for displacing said densified first gas.