Every car has such drains, even your fx has them, doors, wiper cowling, rear bootlid area sides, sunroof drains if u have, power antenna drains.
If you own a nutso bmw or mercedes benz. Then you need to inspect close to 20 drain points on them, and their water channels are sometimes setup like a rube goldberg machine or origami.
Cavity wax is only applied if its flaked/scraped off or someone washed it off. Reapply and forget it.
Wiper cowl/basin will require cavity wax topup about once every 5 years or whenever the motor is removed for work, like ac work.