Question: what is the best shampoo to use in hard water?
Answer: Malibu Hard Water Shampoo. ... 
Ion Shampoo For Hard Water (+ Conditioner) ... 
Kenra Clarifying Shampoo. ... 
Beautiful Nutrition Grapefruit Detox. ... 
Nioxin Clarifying Cleanser. ... 
Joico K Pak Clarifying Shampoo. ... 
Bumble and Bumble Sunday Shampoo. ... 
Ouidad Water Works Clarifying Shampoo.