I was getting poor spray pattern from my washer jets, despite cleaning them out with a pin. Then I discovered the pipes were leaking where they fit onto the "T" pieces and onto the jet bodies under the bonnet. The cheap clips had lost their grip and needed replacing. I found these on Ebay and they are just the job:
http://www.ebay.co.uk/itm/2624…geName=STRK%3AMEBIDX%3AIT
Make sure you put the clip onto the "T" piece first, then push the pipe onto the "T" piece, over the "hump" then feed the clip over the end of the pipe as you push it fully home. It's a really close fit, but when you then clamp them up they are really water tight! Full pressure back again so I can spray the guy behind!