Possible Clues:

• Producer of reddish coat in the West, say
• Something causing rust, for instance
• A provider of oxygen in a chemical reaction
• Botox? I'd anticipated getting an injection of chemical compound
• An agent from the West spoken of
• Something creating rust
• Substance producing rust in west, reportedly
• Such as hydrogen peroxide or ozone
• Neat soldier hiding identity used by agent causing deterioration
• Agent the west picked up