Originally Posted by osxi

I'd like to recommend using a claybar (only on the exterior glass) and then using a window cleaner (I use Invisible Glass because it's ammonia free and can be used on the interior too since it's tint safe).

After that, I would think you can get away with normal cleaning. I use Rain-X every six months or so, which helps a lot with water beading.

Originally Posted by mraz72

for those recommending wax, is this like a carnauba wax or some sort of glass specific wax?

As someone else said, I cannot see how using a wax on your windshield would leave your window streak free.

Originally Posted by GreenandGold831

Invisible glass and a clay bar works great.

Originally Posted by moparado

A bell went off in my noggin when i read that.
Well water spots are likely calcium deposits which would be alkaline in nature.
On the other hand, vinegar is acidic which neutralizes alkaline substances.

Seen a vinegar based glass cleaner on the shelf in the store today.
Immediately tried it out once i got home. It looks promising though i couldn't tell for sure as the truck was out of the sun where these water marks show up.
Might even try adding a little more vinegar in that cleaner container.