It sounds like you have heated washer nozzles. Though I don't know why they would need to be heated. Windshield fluid usually contains methonal alcohol which prevents it from freezing. I suppose it would be to keep the ice off of the nozzles themselves.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member