Cleaner for car windshield?

[razz]

My dealer tells me that vinegar/water will etch over time.

Regular window cleaner (with ammonia perhaps?) leaves streaks.

Tried 'Rainguard' which is great with a light rain but if the rain gets heavier and you need your wipers, leaves a temporary film that obscures one's vision for a couple of seconds especially at night with oncoming lights so no help but rather a risk in slow-down or sudden stops.

Findflo in a previous SLN forum suggested a 50-50% of water and rubbing alcohol for cleaning eyeglasses. I have used that since then. Tried using it on the inside of windshield with success and it helped remove some of the Rainguard.

What works well in a 4-season world on inside and outside of windshields?
TIA

[pony mom]

Last night I tried something I found on YouTube that will remove the smeary streaks from the inside of the windshield (caused by the plastics and vinyls off-gassing). Driving at night has been difficult for me because of the film, which makes oncoming lights annoying.

I did this: https://www.youtube.com/watch?v=axI5Luw0Eos and it worked amazingly well. Tonight was like driving without a windshield---everything was so clear and no smeary glare.

Here's his exterior video: https://www.youtube.com/watch?v=axI5Luw0Eos

[razz]

Thank you. That is exactly what I was looking for.