I have one of those car body squeegees and it hasn’t hurt my car any, and I think the product you’re referring to is a DEhumidifier, not humidifier. Your car is wet enough as it is, would you really want to add to it? 
I have one of those car body squeegees and it hasn’t hurt my car any, and I think the product you’re referring to is a DEhumidifier, not humidifier. Your car is wet enough as it is, would you really want to add to it?