Round Spots on Low E Window Glass

We have multiple dots developing on our low E windows. They are in the front and back of house, so it doesn't matter which direction the sun is coming from. We had the original installer out to look at them, but since they are beyond warranty, he just shrugged his shoulders and said he had never seen this problem and we were pretty much ignored.


Has anyone heard of this and what might be causing it? They spots are definite round circles as are polka dots.

By Laurie from Edmonton, Alberta

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March 25, 20100 found this helpful

It might be where acid rain hit them,we had that happen to our car windshield. We washed it several times with vinegar & a sponge mop. It helped, good luck.

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March 26, 20100 found this helpful

We had new pella windows installed on our house a few years ago, we had large circles on windows. They said it was from the factory the way they move the glass, it took a few years to remove them, and when the sun is just right they still show. Pella did not stand behind the windows like they should have, the local window company that installed them messed up and the company said it was due to poor installation, and the local glass company said it was a fault of the pella 's manufacturing.


That put us in the middle with no fix to problems. Loved the windows with the shades in between panes, but would not ever go through pella again.

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March 28, 20100 found this helpful

Contact the window manufacturer.

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