what smelled like perfume to montage?

Well, eric, montag was saying the kerosene smelled like perfume.

He and clarisse were talking about him being a fireman, and clarisse was complaining about the smell of kerosene.

Montag thinking that kerosene smelled as perfume reveals how imersed he was in his sinister job.

Kerosene. Proves he enjoys his job. Eventually becomes sickened by it.