Clean Glass
I have been washing our vehicles for over 55 years and I have yet found a product that cleans the glass. I generally use the standard Windex and paper towels and in the shade the glass looks good but ...
Forum Discussion
IMHO, the secret is a good squeegee. Water, vinegar and water, windex, whatever matters less.
If you use any thing like paper towel, newspaper, a rag to dry the window, you will get streaks because they all leave just a trace of moisture behind. If you are lucky, it might dry quickly enough to be streak free, but a squeegee it's all or nothing. If the squeegee is clean and supple, the glass is instantly completely dry and utterly streak free; if the squeegee has a bit of something on it that leaves a streak, you need to wipe it clean and do the glass again. But either way, you know immediately if you got it or not.
If you use any thing like paper towel, newspaper, a rag to dry the window, you will get streaks because they all leave just a trace of moisture behind. If you are lucky, it might dry quickly enough to be streak free, but a squeegee it's all or nothing. If the squeegee is clean and supple, the glass is instantly completely dry and utterly streak free; if the squeegee has a bit of something on it that leaves a streak, you need to wipe it clean and do the glass again. But either way, you know immediately if you got it or not.
