Whilst an old thread, I found this very useful and relevant to my '08 3.0 Tdi D3 Quattro at 71,000 miles.
Symptoms: Feeble windscreen wahers but working. Headlamp washers appeared ok.
Cure:Taking the more 'difficult' route of part- removing the wheelarch liner to get at the small filters in BOTH the rubber grommets of both pumps, windscreen and headlamps.
The only amendment I would make to previous posts is that it is essential to clean the higher pump (in the washer tank) filter as well as the lower one.
Mine was even more clogged with algae than the lower (windscreen) pump filter.
Good practice having to remove the liners too, as there's bound to be a reason for doing so at some time in the future!
Thanks for very helpful posts everyone.
