system
Given the following post, respond as if you're commenting on Reddit:
human
Why do my car windows fog up in a way that I can't wipe it off?

I googled and understand the basic gist of why it fogs in general (humidity, temperature, etc) and that all makes sense.      
.


But what I do not understand is why sometimes it seems to fog up...differently? I wipe off the outside with a rag and then wipe off the inside with another dry rag. My common sense then tells me that I should be able to see clearly. Yet, there is seemingly some phantom fog that can not be wiped on either side of the windows regardless of how hard I try to wipe it off. Only when I start to turn on the heat/AC or open the windows does it gradually begin to disappear.


.

Why does this occur? Everytime I drive I make a mental note to myself to ask ELI5 but I always forget!  
 My car is an old car if it makes a difference (i noticed newer cars seem to fog less, but I don't know why that is the case)
gpt
The chemicals produced by human breath (due to diet as well as environment) go beyond what natural evaporation is capable of.  Speaking anecdotally, try purchasing some Rain-X anti-fog wipes and cleaning all of your internal window surfaces.  You will not be disappointed.