can you use mouthwash to deice car

[KatherineAnn]

No, you should not use mouthwash to deice your car. While some mouthwashes contain alcohol which can lower the freezing point of water, it is an ineffective and potentially damaging method. The primary type of alcohol in most mouthwashes is ethanol, but it is diluted with water and other ingredients like coloring and flavoring agents. These additives can leave a sticky, sugary residue on your windshield that attracts dirt and impairs visibility. More critically, the alcohol concentration is too low to work effectively against ice.

A much greater risk is the potential for damage to your vehicle. The chemicals and dyes in mouthwash can harm your car's paint and the rubber seals around the windows. Furthermore, if the mouthwash contains methanol, it is highly toxic and its fumes should not be inhaled in a confined space.

For safe and effective deicing, use a dedicated commercial deicer spray or an isopropyl alcohol solution mixed with water. The best practice is prevention: use a windshield cover overnight or start your car and let the defroster work for a few minutes. Physically removing ice with a plastic scraper and brush is always the most reliable approach.

Method	Effectiveness	Risk to Vehicle	Cost & Availability
Commercial Deicer	High	Low	$$; available at auto stores
Isopropyl Alcohol Mix	High	Low	$; available at pharmacies
Mouthwash	Very Low	High (paint/rubber damage)	$; available at home
Vinegar/Water Solution	Low-Moderate	Low	$; available at home
Warm Water	High (temporary)	High (cracked windshield)	$; available at home

[Cook]

Trust me, I tried it once out of desperation. It just makes a slimy, colored mess that freezes again in seconds. You're better off spending those thirty seconds scraping. The little bit of alcohol in it isn't strong enough to do anything useful. Plus, you'll worry all day about what that blue gunk is doing to your car's paint. It's a total waste of good mouthwash.

[VonTimothy]

As a chemist, I can confirm this is a bad idea. The alcohol content in mouthwash is typically only around 20%, which is too diluted to be an effective antifreeze. The remaining components are water, sweeteners, and dyes. These non-volatile compounds will remain on your glass and paint as a residue, potentially causing visibility issues and long-term damage. The energy required to melt ice is significant, and mouthwash lacks the chemical properties to manage it efficiently.

[LouisLynn]

Here’s what my mechanic buddy told me: never put anything on your car that isn't made for it. The stuff in mouthwash can dry out and crack the rubber around your windows over time. A cracked windshield seal leads to leaks and expensive repairs. Just use a proper ice scraper or a deicer from the auto parts store. It’s cheaper than fixing the damage from a shortcut.

[AuroraDella]

The most immediate danger is to your windshield wiper blades. The additives in mouthwash will degrade the rubber, causing them to streak and fail prematurely. You'll end up replacing them more often, which costs more than a bottle of actual deicer. It's a classic case of a "life hack" that creates more problems than it solves. For a safe homemade solution, mix two parts isopropyl alcohol with one part water in a spray bottle.