Originally posted by epattonm:

Second, what about all the automatic car washes? They all use hot water. I've taken my beater thru one when it was ~20F out (it was free with a fill up).
I just don't see the glass shattering due to some hot water. Although, I can't say I've ever done it, so this is based on observation.

~Eric



Well, FWIW, all the automatic car washes around these parts have warning/CYA sings at the entrance warning of cracked windsheilds if its cold/hot enough. Around here it seems that they get hot enough in the summer cold water will crack them. Not sure if the opposite is true in the winter, but I have seen it happen during the summer with cold water.

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