Every time i use the washer on 2001 Mondeo it blows the fuse?

I've a 2001 Mondeo which blows the fuse every time i try to use the windscreen washer (front or back). This does not happen when i use the windscreen wipers though (they're on the same fuse).
I've been reading all relevant posts and will try just cleaning the washer bottle out first but don't know if this will do it or if it'll be the pump. Has anyone any ideas?
Thanks