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Had same symptoms after using non BMW windscreen fluid, the pump was turning with little water on the windscreen. The headlight jets were working well. Tried Calgon overnight and still blocked. Unplugged the pipe going into the jets and tried blowing into it. The water in the tank bubbled for a second then was blocked, so used a cheap Halfords tyre compressor and it cleared the blockage. Filled with some hot water from tap to dissolve any extra gunge and the windscreen washers now work great.
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