Q: i clean windows for work and usually just use vinegar and water to clean off hard water spots, but i came across a business that wants their windows done, and tried to get it off and their water spots are not coming off, i used water and vinegar, lime away, and even tried the old wiping it off with newspaper, and that doesnt work just smears it. i really need some good suggestions on what products i should invest in, becuase if i can get these spots off this business its some serious cash. please help me out....
A: http://www.ehow.com/tips_17643.html