Step 1: Understanding the Concept: 
The process of "washing clothes" or doing laundry involves a series of steps to clean and prepare garments for wearing again. The question asks to identify the activity that is not part of this cleaning process. 
Step 2: Detailed Explanation: 
The typical laundry process includes:
    
 Sorting clothes.
    
 Pre-treatment, such as stain removal.
    
 The main washing cycle (using water and detergent).
    
 Rinsing to remove soap.
    
 Drying the clothes (by hanging or using a machine).
    
 Ironing/Folding.
Storage (placing clothes in a closet or drawer) is the action taken after the entire washing and preparation process is complete. It is not part of the cleaning process itself. 
Step 3: Final Answer: 
Stain removal, washing, and drying are all integral parts of the laundry process. Storage is what is done with the clothes after they have been washed.