Inspection cleanroom wipes must have the following properties they either clean the surface to final cleanliness or make final contact with the surface after the final cleaning.
Cleanliness - The inspection rag must be at least as clean as the most important rag used in the cleaning process. In fact, it should be the cleanest rag. Therefore, they must be cleaned in a clean room to remove all particulate, non-volatile (NVR), and ionic contaminants. Preferably, it should have a sealed edge or a sealed border, as this is where the rub-off occurs.
Absorbency – Check that the absorbency of the wipe must equal or exceed all other wipes used in the cleaning process so that it can act as a final clean and capture any contamination left over from previous wipes.
Durability - Wipes shall not fade and resist any chemical or mechanical (abrasive) attack. Pure 100% monofilament polyester is perfect for the task, which is why it's used in the cleanest cleanroom wipes.
Visibility - Particles and contamination on wipers must be clearly visible. Dark stains are clearly visible on a typical white wipe. However, to see all other residual contamination, you'll want to use the darkest-colored wipes available. Blue rags are not enough.
The correct size wipe must be large enough (minimum 6"x6"; 9"x9" is best) to operate properly