Special aviation approved insecticide which has also to be used on all flights from outside Europe into France. Container is actually a very small spray bottle with 2 stickers, one to be removed and placed on a special document for inspection by authorities. Cargo area and cabin has to be sprayed, announcement to passengers should provide details that this is a legal requirement for certain flights and that the insecticide is harmless.
Does not need to be sprayed before departure, anytime during flight is acceptable.
Spraying of cargo bay often triggers fire alarm as bottles are activated and placed up-right on floor, after cargo door closing the spray creates a misty / foggy environment for the smoke detector and this makes the cockpit crew jumping off the seat as the passengers are already on the aircraft......
Leaves a lot of space for thinking but is a no-go item if no sprays are available before departure.