Related Clues:

• Sodium hydroxide solution
• Caustic potash, e.g.
• Drain unclogger
• 'Fight Club' agent
• Caustic application
• Boa, for one
• It's used in soap-making
• Potassium hydroxide, e.g.
• Drain cleaner component
• Caustic potash
• NaOH, familiarly
• Cobra, e.g.
• Treacherous type
• Wood ash product
• Charmer's pet