The Washing Machine Man

Appliance Specialist.

Etched glass.

Why are the glasses cloudy at the end of the dishwasher cycle?

Soak a cloudy glass in white vinegar for several minutes and then rinse and dry.If the cloudy condition is removed, you have hard water deposits or residual detergent. If it remains the glass has been etched.

Etching is a permanent pitting of the glass surface.It begins with rainbow coloring when the glass is held to the light and advances to a cloudy appearance Once glassware is etched it cannot be restored. The cost of the glassware does not determine if it will etch.

Etching can be caused by too much detergent for the level of water hardness in your home.If you have a water softener, use less detergent. When water is softened, the minerals that were in the water are removed. Detergent requires some minerals, oil and food to break it down. If it doesn't break down, the dishwasher acts as a sandblaster, blasting grains of detergent onto your glassware at high speed, leaving the glass pitted. Manually prerinsing dishes to the extent of removing all food soils adds to this condition. ( That doesn't mean leaving the dishes full of grease, just a bit will do. ) Lower water temperature can prevent complete dissolving of  the detergent as well and so, leaves more detergent to cause etching. Our mains water in Adelaide seems to have sufficient minerals to prevent the etching process. It is rare to find this happening in mains water supplied areas unless a water softener is used.

Overloading the racks of the dishwasher can prevent proper evacuation of the solution and leaves detergent on the dishes. Rinsing is hampered and the dry detergent remaining can  leave the glassware and dishes cloudy. Overloading can cause some models to stick in the cycle too, or prevent the heater operating leaving behind a poor result. 

Water spotting has several causes too.If too much detergent is being used it may be left behind in the rinse water and may be depositing on the dishes.The water temperature may be too low. Hotter water dissolves the detergent better for more complete rinsing.

Rinse aid should always be used to improve drying performance Rinse aid is dispensed in the final rinse to improve water 'sheeting' action. This allows the water to slide off the dishes more easily. 


┬ęCopyright Tony Pike 1/1/2011

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