Intermittent air coming out of central vents
 

Hi,

I have an A3 2008 and over the last couple of years, I have noticed that, more often than not, air does not come out of the 2 central vents. I ran into this problem 2 years ago and the dealership said that they resolved it by flushing out the vents. Are they clogged somehow? How can I do it myself? I don't want to particularly pay them to do something that can potentially be done by myself.

P.S. Newbie on this forum so pardon any mistakes.

Cheers.