Blocked rear washer jet.

[doctor46goat]

Top-tip for anyone with a blocked rear washer jet like I had, and also had on my last S3.
Just spent about 30 mins removing the inner boot hatch trim to get to the washer pipe so I could blow the jet out only to find I didn't need to.
If you remove the outside cap on the end of the wiper arm you can seen the jet housing, it simply pulls off carefully, you can then activate the rear wash to flush out the chamber, and wash/blow through the jet (backwards) to clear out any sediment or gunk like I had in mine!

 

[LEE69]

A new jet is about £10, i tried cleaning mine, but it wasn't having it, so bought a new one.

 

[doctor46goat]

I gave mine a poke through with pin and blew it out with my air line.

 

[LEE69]

Mine just wouldn't clear tried soaking it in vinegar too, wasn't having it at all.