Related Clues:

• Battery liquids
• Bases' chemical counterparts
• Lemon juice and vinegar, for two
• They turn pH paper red
• They're far from basic
• Sulphuric and muriatic
• Battery fluids
• Chemicals that sound made-up?
• Lime juice and vinegar, for two
• Some invisible inks
• Orange juice and soda, chemically
• Sour compounds
• Potent cleaning solutions
• Powerful cleaners