Why does the interior of my rear car windscreen get totally soaked with condensation?

[splatfrog]

And none of the other windows do? The car stands in the open air, totally exposed. I can't fathom it. I'm having to dry it with a towel before I drive each time. Where's all the moisture coming from? Nothing is kept in the car.

Mine do this too, and freeze on the inside when it's really cold. I have tried the microwave bean bag things and they haven't worked for me.
At the moment I am using cat litter in a tied sock on the front and back screens of the car [ I saw this as a tip somewhere ]. So far it has worked fairly well. Whether it will work once we get frost I'll have to wait to see.

What's the science behind dirty windows and moisture in the car? Are you sure thats not a joke

I had it once and like a pp it was because of leaves blocking the air vents, worth checking

this.
moist air droplets cling to dust and grime.

and clean the air vents too. leaving (ha!) leaves there is also a fire hazard.

and leave the vents on outside air setting most of the time.

and yes to the travel mug with hot - that's not helping either.

Its easy to bring lots of water in to the car with wet shopping bags, strollers etc, the water cant escape and forms its own microclimate that steams up the nearest window.

If the car is over 7 years (ish) of age the rubber door and boot seals get hardened and stop working as well as they should, and begin to let moisture and rain seep in. Fix this by spraying the seals with silicone oil (from halfords) to revitalise the rubber.

Yeah I don't think it's anything to do with the seals, my car has done this since brand new as did the previous one

I have one of those dehumidifier pots with the crystals in my car. It's sorted out the ice problem I used to get and it demised so much quicker than before. They're useless in a room but great in the confined space of a car.

The mini damp traps are fantastic on windowsills. I buy multipacks of the mini ones and have two on every sill in the house, tucked behind photo frames or curtains. I generally replace them once a month ish by which time they're full of water and we never get a drop of condensation on the windows now - they used to be misted up every morning.