This will not harm plastic or degrade rubber. However, It could damage your paint. I would drain the washer reservoir and flush it with water. If you have used the washer with the anti-freeze, flush with water in the reservoir and spray the windshield to clean any residue out of the hose. Wash the car to prevent damage to the paint. If the windshield wiper streaks you may want to replace the windshield wiper blades.
Ifs the antifreeze is in the washer fluid no it should just freeze at a lower temperature assuming it isn't too much in which case think about trying to lower the total amount and then refill it with washer fluid Hope it helps Dave
It can do harm to seals (the alcohol in washer solvent) I'd flush cooling system and refill w/ new anti freeze.
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