How NOT to De-ice Your Windshield
Last night, the DC area had a wintry mix that left exposed vehicles with an icy coating. I returned from an appointment early this morning, and I pulled into the parking lot where I saw the gent who would inspire this post.
I’m fortunate to have a covered spot; therefore, the icy conditions didn’t delay my commute. When I had left the lot for my appointment, there was a guy scraping the windshield of his Toyota Celica…30 minutes later when I returned, he was still there, but now pouring a bucket of steaming hot water on his back windshield. (Everybody together now, “GASP!!”)
I thought, “Well that’s not very smart.” Then I rolled down my window and politely said, “Hey, just so you know, that can crack your windshield.” He didn’t seem to understand what I meant so I reiterated the point: “Hot water can cause the glass to crack.” A look of sheer surprise came over his face and then a look of guilt, as though I had caught him with his hand in the cookie jar. (To be fair, his reaction could have been because I may have used my “Mom” tone.)
He had nearly finished scalding his windshield and nothing shattered. I tried to comfort him by saying that he’s probably fine this time, but he wouldn’t want to do that in the future. I felt a little bad for the guy, but hey, he’ll know better next time! Consider it my good will act of the day.
This leads me to the entire purpose of this post. The take-away is as simple as these two, measly sentences on how NOT to de-ice your windshield:
Do not pour hot water on a frozen or iced-over windshield. The temperature difference can cause the glass to crack.
Don’t believe me? Watch this captivating video from Billy-Bob.
You’ve woken up after watching that clip but still aren’t convinced. Perhaps a little scientific evidence will help. OK, the term is: “thermal shock.” I’m no scientist, but allow me to try to explain.
Say your car has a few minor dings or cracks in the windshield - typical damage from rocks and debris when on the highway. Well, those specks may seem minor, but they can cause major problems if you do not heed this advice.
It’s 20 degrees outside, and your windshield is completely iced over from the wintry mix the night before. You pour hot water onto that below-freezing-temperature glass and it seeps into those small dings/cracks and freezes upon impact. And we all know that water expands when it freezes. So now it’s in the crack of your windshield and it is growing with nowhere to go. This causes stress to the glass around it, resulting in a cracked windshield.
If that’s not enough motivation, then, for those of you trying to keep your girlish figures out there - scraping off ice the old-fashioned way also burns calories.