I thought I'd share the solution to my washer nozzle problem. I thought they were blocked and or needed adjustment, the drivers side was weak and the passenger very weak then ceased to work at all.
Having learnt that there was no adjustment I first bought 2 nozzles from ebay for £5.95 which were supposed to be guaranteed by ebay for my car. They were nothing like, so back they went and I got my money back. I then ordered genuine Porsche parts from Eurospares which cost £33 including shipping and VAT. They were definitely the right part.
When I came to fit them I discovered that the pipe from the Tee-piece connecting the left hand nozzle had become disconnected. It is only just long enough to reach the nozzle, Porsche must have had a savings drive on plastic hoses at the time they built the car. Anyway, I replaced the left hand nozzle as I had it, reconnected (with some difficulty) the water pipe and added a jubilee clip to hold it in place and hey presto it all worked perfectly. The pipe had been working its way loose for some time and so the water was making its way out by path of least resistance and the reduced pressure meant the right hand water jet was feeble. I probably didn't need to replace the nozzle but I did it anyway as I live in a really hard water area and there is bound to be deposits inside.
Morale of the story, if you have feeble water jets like mine , first check the pipework is firmly connected. I am going to replace the left hand pipe with new hose in time to stop it happening again.
Duncan