Things You'll Need
Soap sum can build up on car windows and windshields fter frequent washings. Soap scum has a filmy, white look to it. Remove soap scum with baking soda. The baking soda won't scratch the glass and is non-toxic to animals and people.
Pour a cup of baking soda in the bowl. Add 1/4 cup of water and mix together to make a paste. If the mixture is too thick, add another 1/4 cup of water.
Dip the sponge in the paste, then scrub the window with it, cleaning one area before moving on to another.
Thoroughly rinse out the sponge, then use it to rinse off the paste on the inside of the window. Rinse the outside glass with a hose or bucket of water.
As needed, spray glass cleaner on the window and wipe it off with paper towels to get rid of streaks.