Glass shower doors can be cleaned like a professional with a few simple techniques. Start by collecting the necessary supplies, including a squeegee, white vinegar, dish soap, a sponge or microfiber cloth, and a towel. Before cleaning, remove any loose dirt or debris. Mix equal parts of vinegar and water in a spray bottle and spray the solution onto the shower doors. Use the sponge or cloth to scrub the glass, paying attention to any stubborn spots. Rinse the doors with water and use the squeegee to remove any excess moisture. Finally, dry the doors with a towel to achieve a streak-free finish.