Staining can be caused by a variety of factors:Clogged or Shallow Tear Ducts: Studies indicate that 20-25% of small dogs and cats are born with closed or shallow tear ducts. Tears overflow because in certain breeds the eyelid space is not deep enough to contain them.Excessive Tearing: When the facial hair is wet from excessive tearing, it becomes a

Please use the amount recommended. Using more detergent should not hurt your clothes or a regular washing machine, but it can damage a HE washing machine. If you own a HE machine, it is important that you use only the amount recommended. 

For medium loads, fill the cap to line 1. For large and heavily soiled loads, use a full cap. Or, if you have the 86 oz. bottle, fill the cap approximately halfway for medium loads.