Does defogging work with all windows?

While we can fix 80% of windows, unfortunately some of the windows are either too far gone or can’t be drilled through.

Tempered Safety Glass

Industry insiders call this mark “the bug”.

The first example of a window we can’t fix is safety glass. Patio doors and other windows at a higher risk of breakage are required or designed to be made from tempered glass. This glass has extremely high surface tension and if we dry to drill through it, it makes a very loud sound before it breaks into a thousand tiny pieces! You’ve seen this in car windows and bus shacks likely. All tempered glass should have a stamp in one of the corners that says “TEMPERED”.  We can’t fix it, you should replace the glass with one of our partners.

Spacer Bar Corroded

The second example of a window we can’t fix is one that has completely a rusted or rotted spacer bar (very obvious). While we can get the moisture out, it may return. In this case your seal really has failed because of moisture left in the window over a period of time. We can attempt a defogging but we will recommend replacement at this stage.


Then there are the windows that we can fix, but will produce less-than-perfect results. These windows have white streaks and staining inside. This is caused by the moisture in the glass dissolving the spacer bar desiccant. When that desiccant dissolves it forms silica-scale on your glass. This will fade with a defogging but it will not disappear. While defogging is still the most cost-effective solution to get the R-Value back in the window, if you want the white streaks gone you should replace the glass.

Moisture you can touch

We can’t fix the weather! Similarly we can’t fix the environment inside of your home. If all of the moisture is something you can touch, the humidity in your home is probably too high. You can try this one trick to see where the fog is.