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The problem with a normal "pin hole" jet is that the alcohol in the wash mix evaporates at the hole, leaving water behind which freezes.
One of the manufacturers solved this by developing jets with rubber "lips" which close over the end and prevent the alcohol evaporating. IIRC it was Volvo.
I had a Focus company car which had heated jets. But guess what, they only came on with th erear screen heater which was on a 10 minute timer!!!!! Which numb nut thought that logic up?? one of the reasons I hate Fords - when they can't even engineer something so simple properly.
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