I love this product!  I have a high efficiency wash machine & was ready to sell it, since towels didn't smell clean & stains didn't come out in clothes, even after pre-treating.  I just throw one Tide Stain Release pac in the wash machine with detergent & towels smell fresh, without bleach.  I had been adding bleach & all of my dark towels have bleach stains on them.  Also, my son works at a fast food restaurant & using the Tide Stain Release pacs get out the grease stains without pretreating!  Finally a  product that really does the job.