Related Clues:

• Soapmaking solution
• Oven cleaner ingredient
• Rejected scratch 'n' sniff sticker #2
• Corrosive cleanser
• Solution in soap and frosted glass
• Sodium hydroxide solution
• Caustic potash, e.g.
• Drain unclogger
• 'Fight Club' agent
• Caustic application
• It's used in soap-making
• Potassium hydroxide, e.g.
• Drain cleaner component
• Caustic potash
• NaOH, familiarly