I have no idea.
I also have a question:
What am I doing wrong my windows are partially smudged and you can see streaks?

I had to send mine in for repair under warranty.

In my experience, they don't get clogged but simply dry out (or have air in the feeder tubes?) when the reservoir is low. After making sure the reservoir is never empty or low, I stopped having trouble with nozzles not spraying reliably.