yesterday, I brimmed the Clios (empty) washer bottle, then gave my screen a quick squirt. Four hours later, i went back to the car to find a big puddle by the offside front tyre. I traced the puddle back to the spoiler (dripping), the offside fog light surround, the fog light, up the bumper and to the offside washer nozzle. Its got what looks like a permanent weep, with water trickling out of it. I checked the washer bottle and guess what - empty. At least I now know where the leak is...
g