Try Febreze on that fan, perhaps. It worked in getting cigarette smells off my clothes and couch and in my car, etc.
Chemical smells from cleaners always get to me. 409, the ammonia, Lysol the strong fake pine smell... others I forget because I don't use them anymore. Oh, I dislike the smell of Dawn detergent but I use it because it's colored blue so when you dilute it in a spray bottle, it's easily distinguished from the water in another spray bottle.
For nasty stuff or enclose spaces (bathroom, e.g.), I got a cartridge-filtered face mask from the lumber yard.
Terry, 230RN