The best ways to clean glass shower doors when they develop a hazy dull appearance may be easier than you think. The first thing you need to establish is the cause of the problem. Shower doors often get dull looking because of lime, hard water build-up or soap scum. When you know the cause of the problem you'll be able to clean your doors with the right solutions.
There are numerous products on the market for cleaning glass, however, if hard water is the culprit, the answer to this cleaning dilemma can be found in your own kitchen. White vinegar and baking soda are great cleaning solutions for many household problems and they work exceptionally well on hard water deposits.
Make a paste of the baking soda and apply with a copper mesh-scouring pad to prevent scratching the glass. Using a circular motion, scrub the doors well. Once this is done rinse the glass doors with straight white vinegar making sure to have the room properly ventilated because the vinegar smell will be strong. Let dry and apply a coat of turtle wax or Rain-X to the door to prevent further buildup.
Soap scum left over a long period of time can result in a thick gunk on shower doors. While vinegar may dissolve some of the scum there's likely to be traces left that need closer attention. Chemicals bought for soap scum removal can be quite hazardous if the area is not completely ventilated and masks must be worn to protect the lungs as well as gloves to prevent burns and chaffing of the hands. For this reason, it is far safer to use natural products.
Fill a spray bottle with white vinegar and spray the entire glass door. Allow to sit for about five minutes and spray again, then use a razor blade to gently scrape the glass. This is best done in small sections starting at the top and working down to the bottom keeping the glass sprayed while working downwards. The soap scum that has not dissolved will come off in clumps that resemble candle wax. When you're finished rinse the door and apply turtle wax or Rain-X to prevent soap from sticking to glass.
Glass is made with powdered limestone sand. Some spots can become embedded in the glass and no amount of cleaning or chemicals will remove them. When every cleaning technique has been exhausted, it may be time to get out the big equipment.
A glass polisher or restorer can be used to gently buff out the spots. If using a polisher, find a powdered lime remover, mix it with a small amount of water and slowly polish the glass in small sections in a circular motion. Once all the glass is polished, rinse the surface well and apply a coat of turtle wax or Rain-X, which will protect the glass from water damage.