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Hi andyellis111 welcome to the forum
You could try the following
Syphon out all the water currently in the washer bottle, the lot.
Half fill with hand hot water not boiling, leave it stand for a minute or two, then try your rear wash wipers again keep em going for 15 - 20 second bursts. Let them stand, then try the same again.
Currently in hondo's garage:
1.6 Valve-Matic SR. Red hot, toasty feet.