If your race car has no defroster and you have ever had to pit in or DNF because you dropped your rag-on-a-stick... polish the inside of the window with Dawn dish soap.
It is magic.
I'm really beginning to like this section. 
I've use this as well as shaving cream.
I need to try this on my mc helmet shield....it fogs bad this time of year.
I use rainx antifog on my MC helmet.....seems to work well, don't wipe the inside off with a wet rag though.
Thank you GPS, as my bmw doesn't have a heater core anymore, this is relevant to my interests. 
Also works with clear shampoo.
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