How can I effectively clean years of soap scum off glass surfaces?

To effectively clean years of soap scum off glass surfaces, mix equal parts white vinegar and water in a spray bottle. Spray the solution onto the glass surface and let it sit for a few minutes. Then, scrub the glass with a non-abrasive sponge or cloth. Rinse the glass with water and dry it with a clean towel. Repeat the process if necessary until the soap scum is removed.