No probably not...but why take the chance? If I did run the engine and then had the lines flushed, any time in the future that the engine light comes on - in my mind I'm going to think "Fuck! It was that goddamn washer fluid!" And even if it has nothing to do with it, I will never really know and that will piss me off, lol.
Plus, like I said it didn't cost me anything to have the reservoir drained - prob would have charged me if they had to flush the entire system.
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