The first step in developing an effective precision cleaning process for the product is to determine where cleaning can be avoided. Keeping the product clean, particularly during transfer and storage, is an important part of your contamination control program.
Much effort is expended in keeping the cleanroom clean, in monitoring the cleanroom. Much effort is expended in developing, validating, and monitoring cleaning processes for both so-called “high-end” products and for industrial applications. It is critical to manage three major sources of contamination for products fabricated within the cleanroom. These contamination sources are: People, Equipment, and Transfer.
From : Keep Product Clean In and Out of the Cleanroom, Part 2: The Program