Washers not working :-(

Recently put some more screen wash in the reservoirs (which might have been a bit dilute).
Car is garaged, but was been left out on a freezing day.
Motors run, but screen jets trickle at best (were OK before). Headlamps washers blast away.
No signs of leakage.
I am presuming something got frozen and perhaps little pipes popped off, but where to look first?

R. Mark Clayton

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