Written by Rick

How do I prevent white stains on my glassware?

Most people with a dishwasher will recognize this: white or dull stains on your glassware. Below, I'll tell you where these stains come from and what you can do about them.

Find the cause of the white stains

Stains on glassware in a dishwasher can be caused in 2 ways. It could be limescale, but it could also be glass corrosion. You can easily find out what's the case for your glasses by rubbing a drop of white vinegar on them. If the haze disappears or moves, it's limescale. If the white vinegar has no effect, we're dealing with glass corrosion.


Removing limescale from your glasses is easy. You can do this by hand, but you can also use your dishwasher.

Remove limescale by hand

  1. Fill the sink with warm water.
  2. Add a cup of white vinegar.
  3. Leave the glasses in this mixture for 15 minutes.
  4. Remove the glasses and rinse them with clean water.
  5. Dry the glasses with a clean tea towel.

Remove limescale using your dishwasher

  1. Put all glasses with limescale in the dishwasher.
  2. Put 2 dental tablets in your dishwasher's cutlery tray. You don't need to add any dishwasher tablets.
  3. Run a standard dishwasher cycle.

Prevent limescale You can prevent limescale on your glassware by making sure your dishwasher has enough salt and configuring the dosage correctly. The salt ensures that the water softener in the dishwasher does its job.

Glass corrosion

You can recognize glass corrosion by white or dull stains that, contrary to limescale, can't be removed. It also occurs in the form of scratches or a rainbow-like discoloration. Glass corrosion is permanent and can't be fixed. The rainbow-colored shine doesn't come from the glass itself, but is a layer that formed on the glass. You can sometimes clean this layer off.

Remove rainbow-like discoloration

  1. Make a paste of water and baking soda or toothpaste.
  2. Rub the paste onto the glass using a cloth.
  3. Rinse the glass.

Prevent glass corrosion

You can't fully prevent glass corrosion, but you can limit its effects. Here's a few things to keep in mind when you're cleaning glassware in your dishwasher.

  • Only put dishwasher-safe glass in the dishwasher. For example, crystal or crystal glass aren't suitable for dishwashers. Keep in mind that even dishwasher-safe glass will start showing signs of glass corrosion eventually.
  • Don't clean glassware at higher temperatures than necessary. Higher temperatures speed up the chemical reaction between the glass, the detergent, and the water.
  • Don't dose too much or too little detergent.
  • Use rinse aid. Rinse aid protects glassware against corrosion.
  • Correctly configure the salt dosage. Water that's too soft speeds up the corrosion process, while water that's too hard causes limescale.

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