Related Clues:

• It's caustic
• After half a century you get quite caustic
• Highly caustic stuff
• Drain-clearing chemical
• Drain-cleaner chemical
• Burning stuff
• Drain-cleaner ingredient
• Cleaning substance
• Hominy-making solution
• Common name for sodium hydroxide
• Corrosive substance
• Chemical in drain cleaners
• Caustic drain unclogger
• Caustic stuff in Drano
• Caustic chemical used in making soap