How to clean inside car windshield?

Use water with 1 drop of Dawn. Wipe with paper towels. Dawn (only 1 drop) cleans windows wonderfully.

Vinegar and water, if you don't want to use glass cleaner.

I use Windex, it cuts into the film that gathers from the vinyl dashboard material. It can be stubborn some times, but it usually cleans it. I use paper towels and follow with a microfiber wipe off if the paper towels left it's dust on the glass. I hope this helps you, Dana!

Dishwashing water. Micro fiber wash cloth. If you don’t have the microfiber a lint free dish towel.

Use original blue Dawn dishwashing liquid & elbow grease. Dry off with wadded up newspaper's. Works wonders on mirrors too!! Been doing this for years!!