For the 1.4 8v engine the injectors are £70.11 + VAT each, part number 1984.E0 and the washer jets are £2.98 inc VAT each. The new washers have a rubber washer on them which should stop the problem. I'll be pleased to see a cover somehow over the injectors to stop any water running off elsewhere. If you check your battery cover under the passenger side washer jet you'll probably find water marks too. I changed both washers for the sake of a few quid. The early cars didn't have the washers with the seal on them. Citroen issued the technical bulletin in March 2006 so check your car by pushing out the jet and having a look only takes a minute. Most dealers have them off the shelf due to common failure and they must be changed at time of injector replacement.