Clearly some writer doesn't have their news facts straight. -4 might be a little unusual in the Pittsburgh area, but we're going below that tonight and it is the forecast high tomorrow.
FWIW, I coated my car windows with dishwashing liguid last night and the ice came off real easy this morning. Hope I can do the same again tomorrow.
I’ve heard vinegar works too. BTW, I did find out that vinegar freezes somewhere in the neighborhood of 0 to -10 degrees F outside temp (albeit I found out by “accident” due to leaving a gallon of it in my garage - not really sure how cold it was in there).