I flew on a TWA flight out of Malpensa (Milan). The flight was very late leaving its' point of origin (JFK) so there was not enough time to clean the aircraft. All of the blankets that had been used by the passengers were piled at the rear of the aircraft and the odor was that of a gym bag containing many unwashed jock straps.
Luckily I was sitting in the forward of the cabin but I pitied the cabin staff that had to work at the rear of the cabin.