I got a fancy "double glass" cup, and put it in the dishwasher. Yesterday I noticed something really weird after the dishwasher finished the cleaning process:

water inside glass

As you can see, there are water "trapped" between the glass layers. The water won't go away when turning the cup upside down, neither when shaking it. I put it upside down all night, to no avail.

Any way to take the water out? (Without breaking the glass... ;))


The glass is already broken (or no water would have been able to get in). The break may seal at room temperature, and open up when the glass is heated.

To test this:

  1. Take a vessel that's larger than the cup, and fill this with hot water.
  2. Submerge the glass in the water, and see if water leaks in.

If water leaks in, the next step is to find the leak. If you examine the glass under a bright light, you may be able to see the crack.

Then leave the glass with the crack pointing down. If you keep the glass hot, the crack may open enough to allow the water to drain out.

You can try applying glass glue on the crack, but I don't see that holding very well. The glue should really be applied on the edges you want to glue together, not on the outside surface of the crack.

It's unlikely a repair will hold long, and (due to the uneven stress on the glass when it's used with hot liquid) chances are the glass will break completely if you use it again.

  • This is a great way to confirm that the seal is broken. Unfortunately, it doesn't solve the problem. Is there a way that the OP could utilize the broken seal to drain the water, and if so could you add that to your answer? – BrettFromLA Mar 5 '19 at 14:55
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    @Brett if it's really broken then it's time to say good bye to the cup anyway, so the answer is useful even if not directly answering the question. :) – Shadow9 Mar 5 '19 at 15:42
  • @ShadowWizard Yeah, if the seal is broken then the cup would have to be carefully hand-washed, so I'd probably throw it away too. And the information in this answer is useful. I still think this answer should be a comment instead. – BrettFromLA Mar 5 '19 at 17:00
  • The problem cannot be solved, the cup is beyond repair unless you've got a glass grinding set at home. – Hobbes Mar 5 '19 at 17:41

Before throwing it away, it must be worth a try to put it in a warm, dry place like an airing cupboard and leaving it there for days or weeks.

In theory, the water will "boil" away and the vapour-laden air will (very slowly) exchange with the dry (or, at least, dryer) air outside.

  • It's worth a try, but considering how murky the trapped water looks, I'm afraid it will leave an ugly residue behind. – Elmy Mar 6 '19 at 7:57
  • I too think it would leave a residue – Caius Jard Apr 5 '19 at 5:56

My idea is to submerge it in dry rice. The water would be absorbed by the rice.

  • The water are trapped inside the glass, rice won't reach them. – Shadow9 Mar 24 '19 at 9:16

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