Corsa screen washer

[Hantek]

My windscreen washer won't spray water on the front windscreen or back window although I can hear the pump working. I have replaced the pump and have the same problem. The original pump works ok when tested at home.

[Clanad]

I've found the plastic tubing from the pump to the outlets to be filled with gunk... may be algae growing.  Additionally, the small spray hole at the outlet becomes plugged with dirt.  Use a pin to open it.  You may wish to flush the holding tank as well... good luck!