Question: what is the best laundry detergent for hard water?
Answer: Wisk Deep Clean Laundry Detergent. ...  Rockin' Green Natural HE Powder Laundry Detergent. ...  Water Boy Liquid Laundry Detergent. ...  Purex Liquid Laundry Detergent. ...  Persil ProClean Power-Liquid Laundry Detergent. ...  Tide TotalScent Care Liquid Renewing Rain. ...  Tide Coldwater Clean Liquid Laundry. ...  Ecover Zero Laundry Detergent.