Hi
​​​​​​2016 D4. Rear and front light jets are working perfectly but the windscreen jets are slow to respond and take a few seconds to work. The pressure is low when they do decide to work it's slightly better than a dribble. Any suggestions as to cause and solution?

👍

 

I'd start with a sewing pin and try to clean out any setiment from the nozzle, after that I'd look for any signs of leaking due to a bad hose or connector.

 

****UPDATE****

Tried a bit of cleaning, flushing and needle poking without success. So I dismantled the jet assemble in the bonnet and found the pressure springs and rubber valve. Cleaned the springs and bingo, pressure restored.

All good 👍

Before and after of the pressure springs taken from XC60 nozzle jets. All three lacked pressure and all three were gunked up like the bottom spring.