Dry Cleaning is the use of solvents to remove soil and stains from fabric. It is called "drycleaning" because the solvents contain or no water and do not penetrate the fibres as water does.
Drycleaning solvent is not harmful to any fabric, and is often the only safe method for cleaning many types of fabrics.
Natural fibres like cotton, wool and silk can shrink, distort, and lose colour when washed in water but dryclean easily. Drycleaning helps to return curtains to their original condition by using precautions to prevent shrinkage, loss of colour, and change of texture or finish.