Historical clue formulations

• Lime and soda, for two — 2024-12-17
• Lime and soda, e.g. — 2022-08-28
• Things that cover all the bases? — 2018-01-20
• They're basic — 2010-05-07
• Acid neutralizers — 2007-10-17
• Acid neutralizers — 2001-03-13
• Acid neutralizers — 1999-08-29