Check that all windows are closed and secured.
Clean the exterior vinyl window panes by using water from the garden hose to dislodge the dirt and rinse it away. Apply the water slowly at first to ascertain if the window leaks. Sometimes a direct, full-pressure blast of water may penetrate into the interior of the window. Start at the higher windows and work your way down.
Pour 10 cups of water into a bucket and add one tsp. of liquid dishwashing detergent. Dip the mop into the solution and gently rub the windows. Work from the bottom of the window to the top. Rinse with clear water from the house, from the top of the window to the bottom.
Use a household bleach solution for stubborn stains. Add a 4:1 ratio of water to bleach to a bucket and apply it as you did the detergent solution. Rinse the window with clear water.
Clean interior windows with water-based cleaners such as Windex or Lysol. Spray a small amount onto the window pane and use a soft cloth to remove the product from the pane.
Remove paint stains by using a plastic spatula to gently dislodge the paint, enabling you to peel it from the window.
Pour a quarter-sized dab of mineral spirits onto a soft cloth and gently rub out more difficult stains such as oil or tar. Rinse the mineral spirits off with water from a spray bottle and dry the pane with a soft cloth.