Possible Clues:

• What you're looking for may involve a certain concentration
• 'Eureka!' cause
• Answer thus to one in town
• The answer is it's been dissolved
• With this it's solved or dissolved
• A completely wet answer?
• A mixture of liquids, that's the answer
• Liquid mixture of substances
• Note the in-out movement: that's the answer
• Mixing in with water could be the answer