Sunroof drains
 

After we had 8 inches of rain at the house I see the A8 either needs to stay in the garage or the drains need clearing.
I climbed up on a step ladder to look again for the four drain holes. Did this before to use a weed eater cord and did not spot them. The diagram from Audi is not clear to me. I assume they are in the open to allow feeding a wire or cord.
What do they look like and are they on lowest level?
I must be looking at them and not recognizing what they are.

They are in the corners, the front ones usually clog, I think. Best to push the wind deflector down so you can see them.

Yes, push wind deflector down and you should see the front ones. You then have to peel back the fender liners to get at the other ends. Mine were so clogged at the fender liner end, I had to go in that way. Going in from the top wouldn’t push it through for me. But I used a weed eater line also. Good luck.

Fifty percent there
 

Ordered some 0.125 nylon tubing off Amazon. Works like weed whacked line for pushing.
After that did not work, connected to the mighty Miley Vac and started filling and vacuuming out the gunk. Looked like Live Oak pollen brackets.
Got the front and rear driver side draining good. Poured in some diluted drain clearer and flushed well.
Working on passenger side now. But how do you access the rear drains?

Done
 

After I posted the passenger side drains cleared. Applied drain clearer and flushed well once the water was dripping.
The 0.125” OD nylon tubing was perfect for clearing. If yours are barely plugged it is stiff enough to poke down. If worse, the Mitey Vac and this tubing can suck out the debris.
It required three flushes to clear the passenger side. My home is surrounded by Live Oak trees and the pollen and brackets are heavy some years.
Also on both sides the rears drains started to drip at the same time as the front. Never located the ports for the rear. Are they connected on an early 2005 model?

the rear drains are difficult to impossible to see from above. You must remove the rear wheels and front facing wheel arch liner to access the rear drains. I hope to do this soon as well. Let us know how it works out for ya.

Rear drains
 

Cleaning out the front drains cleared the rear on mine. Went from no drips with the tray around the sunroof full to a solid stream from all four drains.

Do you have any pictures of the rear drains or just blindly accessing them
Cheers,
Louis