Again, what you are describing will not produce thermal shock. Car wash water isn't "cold water" and is probably less than 10° colder than the ambient temperatu

Again, what you are describing will not produce thermal shock. Car wash water isn't "cold water" and is probably less than 10° colder than the ambient temperature, and it is applied relatively slowly, allowing the glass to equalize before it is stressed. What is required is a sudden change in temperature. For something as thick a car windshield, you'll need a near instantaneous 40° temperature change. If your car windshield was blazing at 150°F and you tossed a bucket full of cold, equalized ice water on it, it's going to shatter. But you have some good ideas, and I welcome new Apple laptops with quarter inch thick glass displays.