Dry cleaning process and composition

Claim 1

IN THE METHOD OF DRY CLEANING TEXTILE MATERIALS IN AN ORGANIC SOLVENT SYSTEM COMPRISING THE STEPS OF INTRODUCING THE TEXTILE MATERIAL INTO A WASHER, CIRCULATING THE DRY CLEANING SOLVENT SYSTEM THROUGH THE WASHER AND THE TEXTILE MATERIAL THEREIN, FILTERING THE DRY CLEANING SOLVENT SYSTEM ISSUING FROM THE WASHER AND RETURNING THE FILTERED DRY CLEANING SOLVENT SYSTEM TO THE WASHER WITH SUFFICIENT MAKE-UP SOLVENT TO MAINTAIN SUBSTANTIALLY THE ORGINIAL VOLUME, AND REMOVING THE TEXTILE MATERIAL FROM THE WASHER AFTER IT HAS BEEN CLEANED, THE IMPROVEMENT WHEREIN THE DRY CLEANING ORGANIC SOLVENT SYSTEM WHICH IS FORMULATED TO CONTAIN A DETERGENT IN COMBINATION WITH THE ORGANIC SOLVENT IS CHARACTERIZED BY CONTINUOUSLY INTRODUCING DETERGENT INTO THE DRY CLEANING SOLVENT SYSTEM DURING THE DRY CLEANING OPERATION AT A RATE CORRESPONDING TO THE RATE OF REMOVAL DURING THE DRY CLEANING OPERATION THEREBY CONTINUOUSLY TO MAINTAIN THE LEVEL OF DETERGENT IN THE DRY CLEANING SOLVENT SYSTEM AT ABOUT THE DESIRED LEVEL FOR OPERATION WHEREBY A MORE EFFECTIVE CLEANING OPERATION IS ACHIEVED AND THE USEFUL LIFE OF THE SOLVENT IS MATERIALLY INCREASED.