Although we do our very best to remove stains, there are occasions when complete removal is not possible. For instance, a stain which has existed for a long period of time is practically impossible to eliminate. Another factor that prevents us from removing a stain is the risk involved of possibly ruining the fabric or the dye in the process. Lastly, certain items will accumulate damaging chemicals over a length of time and will react adversely to our stain-removing agents. To avoid this from happening, we take every precaution to assess the nature of the stain before attempting to remove it.