Clearing Scuttle Vents on C5 x7

[petef]

Does anyone know where to start with clearing the scuttle vents on an x7. My drivers footwell was full of water this afternoon after heavy rain yesterday. Trials with a watering can showed pouring water on into the passengers side of scuttle vent resulted in water running straight out underneath. On the drivers side however the same test resulted in a mere trickle underneath. Something clearly blocked and water getting into car. Are the drains attacked from above with rodding wire? Presumably after taking off the plastic vent cover - I know how to do this after replacing the wiper motors. Or do you have to remove the inner wing cover and get at them from underneath?

[GiveMeABreak]

Wheel lining Pete - here's a Video on it:

[petef]

Many thanks Marc and wielkie dzięki to the guy in the video