Related Clues:

• Etcher's supply
• Soap ingredient
• Sodium or potassium hydroxide
• Drain cleaner ingredient
• Caustic chemical
• Battery component
• Soap-making compound
• Kind of rock or rain
• Tart-tasting
• Aspirin, e.g.
• Oven-cleaning chemical
• Citric ___
• Test subject
• Caustic chemicals
• Word with indigestion or test