Why do my windscreen washer jets keep getting blocked?

Tomorrow I am taking my car in for the third time to have the screen washers fixed/unblocked. The second time I was told that I was using the wrong screenwash, they fixed the problem and refilled the screenwash only for a month later the same problem to reappear. I haven't had to refill the reservoir since they last had the car. I am naturally annoyed with this as every time it happens I have to wait a week or so to get a booking, does this mean that I am in fact driving an illegal car if I can't clean the screen? What should I insist on?

Asked on 28 June 2018 by Barry Vanderpant

Answered by Honest John
This is usually caused by sludge in the washer reservoir blocking the mesh filter for the pump. A quick fix is to get a hosepipe, shove it right into the bottom of the washer reservoir, hold it there, then get someone else to turn on the tap. That blasts all the crud out of the reservoir. However you should also check the pipes from the screenwash reservoir to the jets on the bonnet. If they are kinked or otherwise trapped in the bonnet hinges, then screenwash cannot get through.
Similar questions
I left the screen reservoir lid in my Volvo V40 D2 off overnight. The front and rear jets now have a struggle to pump screenwash. Pumps sound as if they are okay and the reservoir is clean. Any ideas?...
The windscreen washer nozzles on my wife's 2014 Ford Focus gives hardly any output. It appears to be a common problem caused by a clogged filter on the windscreen washer pump. We have been quoted £75 (one...
Our 2011 Toyota Yaris Mk2 has problems with both front and rear windscreen washers. The rear one is now barely a trickle, and the front ones seem low on power. I can hear the pump working, so I'm guessing...

Value my car