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A scented imprint of where it once was

However, since consumers are retrofitting box fans not intended or evaluated for this purpose by the manufacturer, there have been some concerns about their safety during use

Wu, D., Laudsberger, S., & Larson, S

Environ Sci Pollut Res 28:3045230458 Yousefi M, Oskoei V, Jonidi Jafari A, Farzadkia M, Hasham Firooz M, Abdollahinejad B, Torkashvand J (2021b) Municipal solid waste management during COVID-19 pandemic: effects and repercussions

Products like Tide Odor Rescue or Persil ProClean are formulated with enzymes that break down odor molecules

Cleaning can help, but replacing entire systems may be in order