I fitted a new wiper motor today as mine stopped working I noticed that the wash was coming out from behind the wiper and not the jets so I cleaned the jets out but this didn't work just wondering how many others have this problem. It's always been like this since I got the car but never looked at it from the outside before so thought that the jet down the middle of the rear of the screen was normal.

Flip the cap up which covers the locating bolt for the wiper arm - it may just be as simple as the cap isn't locked down in place properly or its gummed up inside the cap (which routes the water from the pipe behind the motor into the nozzles) Current Fleet:-
2018 Discovery 5 3.0 HSE
2021 Ford Ranger Wildtrack
2019 Ford Mustang Bullitt 5.0 V8
1993 Defender 90 200TDI Pickup

Gone - not forgotten
2016 L405 4.4 SDV8 Vogue SE
2012 L322 4.4 Westminster
2004 L322 4.4 V8 Autobiography LE
2000 P38 RR 4.0 HSE (ex Clarkson test car)

The jet is in the cap which snaps down over the arm retaining nut. If its not snapped down correctly it will leak. I think a stupid design as they can split/crack etc. My one failed so I ran a thin drill into the shaft to remove the plastic inset and fitted a BMW Mini rear washer jet which works fine.
https://www.ebay.co.uk/itm/Rear-Windscreen...:rk:1:pf:0 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone