If you want to clean glass shower doors without using harsh chemical cleaners try this natural method. Next time you slice up a lemon, save one half and put it in a plastic baggie. When you're ready to shower, take the lemon into the shower with you. Before you do your body wash, take the half a lemon out of the baggie and use it like a scouring pad on the glass shower doors. Press firmly against the glass, rubbing the lemon until you don't feel the 'drag' of the soap scum any longer. Rinse the glass and continue your shower