"DerbyBorn" wrote in message
2.236...
a cup of hot water with a
dash of washing powder. Vinegar, perhaps?

Given that its likely to be the gel that can form in the
washer bottle, I'd try neat bleach, soak it in a cup of that.



Nooooo- think of the paintwork

No paintwork involved with the spray nozzle in a cup of bleach.