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Not So Great Invention #2

Trivia brain teasers have some element of trivia in them, but they are not just pure trivia questions.

 

Puzzle ID:#16102
Fun:*** (2.7)
Difficulty:** (1.53)
Category:Trivia
Submitted By:od-1Aca****
Corrected By:Monique114

 

 

 



Not willing to give up after a failed attempt to invent a better windshield ice scraper, a would-be inventor decided that heated windshield washer fluid was the way to go. It would melt the ice with a very hot cleaning solution, thereby eliminating the need for scraping the ice off the front windshield. However, this invention proved a failure as well. Passing all tests done to insure it worked, it did indeed remove the ice effortlessly in record time. It even sold well initially, but was recalled for safety reasons.
Why?


Hint

What happens to glass if heated too fast?
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