TLDR Review: Prestone Windshield Washer Fluid De-Icer Additive
Verdict
The Prestone 15.5 Ounce AS240 Windshield Washer Fluid Booster De-Icer Additive is a solid choice if you want a reliable, economical, and eco-friendlier way to keep your washer fluid from freezing and maintain clear visibility in cold weather. It performs exactly as expected with no flashy extras, so if you’re after simple, no-nonsense performance and savings, this is a smart pick. If you want something with more cleaning power or added features, you might want to explore other washer fluid products, but for pure de-icing and freeze prevention, this one gets the job done.
- Top pro:
- Effectively prevents windshield washer fluid from freezing, even in temperatures well below freezing.
- Top con:
- Takes a few hours after pouring in to become fully effective, so it’s not instant.
Pros
- •Effectively prevents windshield washer fluid from freezing, even in temperatures well below freezing.
- •Cleans windshield satisfactorily, loosening dust and dirt to improve visibility.
- •Offers an economical alternative by letting you make your own washer fluid instead of buying expensive pre-mixed gallons.
- •Each 15.5 oz tablet dissolves in a gallon of water to create ready-to-use screenwash, saving money and reducing plastic waste.
- •Reliable and consistent performance reported by users, including in snowy and freezing conditions.
- •Helps prevent wiper fluid lines from freezing and reduces ice buildup on windshield wipers.
- •Useful as a winter additive to maintain washer functionality for cars and heavy-duty trucks.
- •Provides substantial yearly savings by allowing homemade screenwash production.
Cons
- •Takes a few hours after pouring in to become fully effective, so it’s not instant.
- •No additional features or benefits beyond standard washer fluid booster and de-icer function.
- •Performance is basic and purely functional without extra perks like pleasant fragrance or advanced cleaning agents.
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How we researched this
About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Oct 11, 2026.
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