Meguiar’s Professional Glass Cleaner Concentrate, Car Glass Cleaner, Professional-Strength Formula For Streak-Free, Residue-Free, Use On Auto Glass, Windows And Mirrors – 1 Gallon Auto Glass Cleaner

Customers praise the glass cleaner's effectiveness, noting it leaves no streaks and makes 11 gallons when diluted properly. The product has a pleasant grape juice-like scent and leaves glass crystal clear. While many customers report their windows looking great after use, some mention that the concentrate turns black over time.