Yep, generally vinyl plasticizers.IIRC it's not the window cleaner but the off gassing from the dash and whatever you use on the dash that causes the film.
You don't need to use anything, plasticizers are added to vinyl during manufacture. And they will outgas for a long time, one way you know they are gone is when the plastic becomes brittle or begins to crack.I get a film on my windshield and I've never used anything on the dash or elsewhere other than a water damp rag. Maybe it's from 3 years/40,000 miles ago before I bought the car but it's still getting a film.
Ahh.. Someone suggested it was stuff you put on the dash, that's when I thought about this. I've got a 20 year old car that does it, but the dash is 'like new'.You don't need to use anything, plasticizers are added to vinyl during manufacture. And they will outgas for a long time, one way you know they are gone is when the plastic becomes brittle or begins to crack.
Ahh.. Someone suggested it was stuff you put on the dash, that's when I thought about this. I've got a 20 year old car that does it, but the dash is 'like new'.
If it ain't shiny when new, it should not be shiny.This is true and especially if you use “shiny” dash detailer sprays.
Use a matte finish spray and use very little. Shiny dashboards are for the 60’s and 70’s.