207 Window Water Pump?

My washer has stopped spraying and there is no noise from the pump. After some reading I am guessing the fuse or similar has gone. I will try the fuse later.
However as they weren't working I presumed there was no water in and put a big jug of plain water in (no screenwash) with the intention of adding screenwash later. I then forgot but the water stopped spraying out. Now I am left witha tank full (almost to the brim) of plain water and I can't pour any screenwash in. Not sure what to do - especially in relation to the above and I can't just sit spraying it out to get it down. Do i need to drain it somehow

Kez
February 2015