First my car bit the dust, so at least I can drive the wifes for a little while while she uses her dads car. He is an OTR trucker which works out for us. Wife says, my car started acting up today. So, I said what is wrong. My windows are fogging up. So, now I am driving a car that I have to wipe the windows down about every 2 miles or so. Does any of that bottled stuff actually work on the heater core or should I just plan on a couple hundred dollar fix here?? Thanks in advance, I'm going to bed before anything else happens. Tomorrow is a new day, I hope!!!