Historical clue formulations

• Soft drink originally made with egg whites — 2026-07-04
• Dad's pop, perhaps — 2026-06-20
• Classic pop — 2022-09-16
• Vanilla-flavored drink — 2020-09-04
• It's soft and sweet — 2016-12-30
• A&W beverage — 2009-11-19
• A&W offering — 2008-11-14
• Vanilla-flavored treat — 2007-03-25
• Certain soft drink — 1997-03-31