Question

There are products you use on a daily basis which have several languages on them.

On which of these products would you be most likely to find French:

Answer 1

I think it depends a lot on where you are, i.e. which country (or even city) you're in.

However, until 1994 French is the only official language of the Universal Postal Union, that explains the all blue airmail stickers in English speaking countries appear as "air mail par avion".
Not sure if that's what your question is looking for, but just a side note.

Answer 2

perfumes and other beauty/skin/hair products

Answer 3

Shampoo, conditioner (shoutout to Paul Mitchell), air bag warnings on cars (shoutout to Nissan)