Dirty film on inside front window

[deaner70]

Started having issues with a film on the inside of the front window. I can clean window and within a couple days it’s back. Any ideas on where to look? It’s a 2003 2500. Stock other than a MBRP exhaust and intake pipe.

 

[DavidC]

Only thing I have heard of is a coolant leak at the heater core. How's your antfreeze level

 

[MtnRider]

Is it hot where you live? Probably the plastic dash and interior outgassing and leaving a film on the window.

 

[deaner70]

Coolant is good. It has been hotter than hell here lately. Mid 90’s and humid

 

[Regcabguy]

A custom sunshade like Geno's sells and a dashmat helps.
The shades are pricey but last for years and fit. https://www.genosgarage.com/product/ci-11150/heat-shield
I use Costco's windshield aerosol cleaner and a microfiber cloth. I clean it a couple of times and then take a clean old cotton t-shirt and buff the glass.

 

[BigPapa]

I also find the window cleaners don’t clean like they used to. It takes me two or three days so get the inside of my windshield where it doesn’t show streaks from where I cleaned it with the humidity. I spray it and scrub it good then polish it off. The next day and again the second day I have to wipe it down with a clean towel, no cleaner. Finally after a couple of days or dry wiping with a clean towel it doesn’t leave the streaks.

 

[Ozymandias]

Only thing I have heard of is a coolant leak at the heater core. How's your antfreeze level

Second this, coolant is pretty sure the issue.
I had that in the past.
Check the exit of the aircons drain for residues of engine coolant.

 

[slowmover]

Started having issues with a film on the inside of the front window. I can clean window and within a couple days it’s back. Any ideas on where to look? It’s a 2003 2500. Stock other than a MBRP exhaust and intake pipe.

Started having issues with a film on the inside of the front window. I can clean window and within a couple days it’s back. Any ideas on where to look? It’s a 2003 2500. Stock other than a MBRP exhaust and intake pipe.

 

[Blakers]

My truck has that issue since it was new. Hard to keep the inside clean and film free. Perhaps it's the slope of the windshield?

The best way to clean the inside is with a micro cloth and one of those triangular plastic cleaning tools with the handle. It makes it easy to reach everything.

I have one of Geno's dash mats. It lowers the inside temperature of the truck probably 10 degrees in the hot summer sun, even with the AC on. The hug black dash just absorbs the sun's heat.