When you clean the windshield the wiper-mounted jets should squirt a total of eight streams across the windshield - four streams from each jet. For the last few weeks my passenger side is only squirting two strong streams, and the other two are very weak, just a dribble.

I'm not inclined to just start sticking pins in the holes or forcing the hose off the jet to inspect the unit and owner's manual doesn't have any advice.

Where would you start?

I just replaced the whole wiper blades from Jag for $25.each for my 04 XJ8. That was the cheapest I've ever gotten out of the dealership. They include new sprayer heads and the wing on the one side.

Could you pop them off and soak in CLR for a few hours?

Remove wiper from spigot and flexible pipe from jet.

Hold open end of pipe against blocked hole.

Have an assistant operate washers to backflush jet.

Simples!

Just an update to report this has been resolved.

I tried CLR (calcium, lime, and rust remover) with no luck. Tried reverse flushing and also no luck. Stopped by my local mechanic and he took off the wiper assembly and blew air through it, also no luck.

We ended up replacing with a new wiper assembly, blade and jet included. They pop off and reconnect very easily. The unit cost $27.