Hi..
Very easy to clean, stick a pin in the holes.. failing that, open the bonnet and the  look for a black thin pipe runs down the side of the bonnet (and into the washer bottle )its clipped up, and half way down the pipe you have a split that you will see, just take apart and basicly blow down it, its just dust. i used to be a parts advisor for citroen, you cant damage it, and the pipe will connect back together, no worries, hope it helps..
                
 chell'e
                
 March 2009