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On a previous Audi Q3 I had a similar problem. Was able to sort it by filling the tank with hot water (not boiling, just tap hot), leaving it for a few minutes then trying the pump again several times and flushing the tank with hosepipe to remove any residue. A messy job with water flowing out of the filler on the Audi (don't know what it would be like on the X1, but probably similar - I did take off the hose end sprayer though). I now always use BMW screen wash additive, buying a 5 litre bottle that lasts a long time. A pal who had a 3 Series with the same issue took his car to the local dealer who said it's because he had used another make of screen wash additive and it was a common problem in those circumstances, whereas the BMW product contains inhibitors to stop the issue arising. They did, however, flush the system through, but I don't know what they used. Hence, since his experience, I have only used Audi/BMW genuine products and haven't had any problems.
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