"My boyfriend got this for me because I was using windex to clean the top glass of my fish tank but didn't like to use it for the glass top underneath because when the condensation would build up the droplets would drop into the tank & the ammonia from the windex would get in the water. The product does get rid of any deposits that might build up but it leaves behind horrible streaking! Oh, by the way it says to leave it on for 3 min. or longer... Don't... it dries and you have to spray it again to clean the glass"