Spray the shower doors with a vinegar-and-water solution or a glass cleaner
Let the cleaner sit for a few minutes
Wipe the doors with a non-abrasive sponge or microfiber cloth
Scrub stubborn soap scum with baking soda paste or a non-scratch scrub pad
Rinse the doors with warm water
Dry the glass with a clean microfiber cloth or squeegee
Clean the tracks and edges with a toothbrush or small brush
Repeat regularly to prevent buildup