what is the best laundry detergent for hard water?
['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.']