It doesn't get it hot enough to break the glass, 100 degrees or so is all. Still, the Rain-X will do the same job.

 

If the temperature of the glass is about 10 degrees or less, 100 degree liquid could easily break the glass, mainly in a place where you already have a crack or chip. Ask anyone that has been in a carwash on a cold day and watched their glass crack. it happens a lot because people don't think about it.

 

I was going to say the same thing. If there is a crack or even a little star in the windshield it will spiderweb until it hits the edge of the glass.

 

A bottle of 97% Isopropyl Alcohol works quite well and costs less than $1.

 

So will your breath after happy hour...

 

Orange Rain-X fluid FTW! I love that stuff and run it in all of my vehicles all the time. Plus it adds Rain-X to the window. Nothing like beading water flying away!

 

With how much that costs, i'll keep scrapping ice off the windshield.

 

Funny thing, Mercedes has been using them since at least 1991, I haven't heard of any rash of MB windshields breaking, have you? Most heaters are designed to get the fluid about 20 degrees above freezing, not the 100 degrees I mistakenly said before reading the info. I've known of many more glasses breaking on hot days when people open all the windows and the cool breeze passes through, especially rear windows. Not guessing at this, I've been in the upholstery business for 35 years and was in the body shop business also until 1987. The vast majority of heat breakage comes from previously damaged glass, with cold breakage it doesn't seem to matter.

 

I'm going to get really, really crazy here, but what *IF* people parked their vehicle(s) in the garage rather than outside.

I know, it's off the wall but can be done and the results are amazing. No build up of ice or frost, and the vehicle is nowhere near as cold in the morning and warms up much quicker.

 

Gotta have a garage to park in though..... that can be a bit of an issue.

As for this product:

Heat your vehicle's windshield washer fluid to a temperature of 125° -135° F

When its -30 here, I really don't think that would be a good idea....... Suppose it depends on the spray pattern. The fluid isn't being pumped out if a very large volume, and is more of a mist, so, heat transfer probably happens VERY quickly, and doesn't dramatically alter the temp of the glass that much.