2 as the first fluid its temperature can range broadly from slightly below about 20 u00b0 c to slightly above about 100 u00b0 c as indicated on the horizontal axis and the pressure can range from about 1000 psi to about 5000 psi as shown on the vertical axis however within this broad range of temperature and pressure it has been discovered that there is a zone represented by the hatched area of the left or on the convex side of the curve where surface blistering to components such as buttons can be reduced whereas practice outside of the zone tends to lead to button damage that can be quite severe as is seen by the hatched region of fig3 preferred conditions are between about 900 psi to 2000 psi at temperatures between about 20 u00b0 c to about 45 u00b0 c with more preferred conditions being pressure from about 900 psi to about 1500 psi at temperatures between about 20 u00b0 c and 100 u00b0 c or from about 3500 psi to about 5000 psi at temperatures between about 20 u00b0 c and 37 u00b0 c where fabrics are being cleaned one preferably works within a temperature range between about 20 u00b0 c to about 100 u00b0 c in addition it has been found within this range that processes which raise the temperature prior to decompression reduce the damage to polymeric parts suitable compounds as the first fluid are either liquid or are in a supercritical state within the temperature and pressure hatched area illustrated by.