What is a good strong glass cleaner I can use to clean my car windshield? I'm not sure what it is but its not getting clean.?

If it can't get clean with Windex, then you have calcium deposit on the window. The slightly acidic nature of vinegar allows it to soak into and loosen the mineral deposits. Let the vinegar sit for 30 to 60 minutes. To keep the glass wet during this time, spray the paper towels occasionally with vinegar from a spray bottle. Sprinkle a damp rag or sponge with a generous amount of baking soda.

Go to Lowe's or home Depot and buy yourself a 1-gallon container of the natured alcohol try mixing it 50/50 with water that should clean your windshield and remove everything off of that glass.