What are the harms of car glass defogger?

2 Answers
GiannaLynn
07/25/25 3:29am
Car glass defogger does not have any harms. The principle and usage method of window defogger are as follows: 1. The glass surface treated with car defogger will form a relatively long-lasting hydrophilic film, which changes the surface tension of the glass water layer to make it smaller, and the contact angle between water and glass reaches the maximum, thereby making the water appear in a uniform and transparent state without forming fog, thus achieving the anti-fog effect. 2. When using, first clean the inside of the car windshield, then take out the defogger and spray it on the inside of the car windshield. After drying for 1 to 2 minutes, wipe the surface evenly with a dry towel or tissue paper. The effect after using the window defogger is very good. One spray and wipe can prevent fog for 5 to 10 days.
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LaBrody
08/10/25 4:59pm
The volatile chemicals in defogger sprays have strong odors that linger for hours, causing throat irritation and coughing. People with sensitivities may experience dizziness or chest tightness. The smell intensifies when the car interior is exposed to summer heat, and oily residues can cause wiper blades to squeak. Cheap products are worse—their preservatives react with glass coatings, eventually creating a foggy, sandblasted effect that impairs visibility. Poor-quality defoggers can cause dangerous glare during rainy night driving, especially under headlights. For regular use, always wipe the spray evenly with a dry cloth to prevent stubborn residue buildup.
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