Working at LHR 1970 or 71 when the PanAm Round the World flight PA1 was still a 707 (so no containers) I had the fun of helping placate the London terminating pax in the Customs Hall who were waiting for a VERY slow delivery of bags.
What the pax couldn't see was, on the far side of the wall, everyone else from the PA Station Manager down, frantically trying to clean VERY smelly monkey pee and poo from the (usually) expensive luggage that had been unfortunate enough to be loaded before Istanbul where the thoughtful loaders had placed a shipment of a number of cages of (apparently) incontinent monkeys directly on top of said bags!
The effects could not all be erased
and some quite expensive damaged bag claims followed.