Historical clue formulations

• Dangerous compound to mix with bleach — 2021-02-12
• Pungent-smelling gas represented in 57-Across and 49-Down — 2018-09-18
• Major component of Windex — 2018-02-07
• Strong-smelling cleaner — 2012-11-19
• Strong-smelling cleaning ingredient — 2012-07-24
• It's lighter than air — 2008-11-09
• Common cleanser — 2007-08-01
• Unbreathable part of an atmosphere — 2005-09-02
• Suffocating solution — 1998-12-05