1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Welcome to Allpar The lens can't be completely sealed off. There has to be a vent, probably on the bottom/inner side of the lens assembly that allows it to breathe. Some have an 'L'-shaped rubber vent hose pointing down.
If that doesn't help, replace the lens assembly.
If that doesn't help, replace the lens assembly.