Double pane windows provide added insulation for your home or office by placing a gas layer between two panes of glass to impede the transfer of heat through the glass. This means you lose less heat in the winter and gain less heat from outside in summer. The gas, usually argon, is sealed between the two layers of glass in the manufacturing process. If the seal is compromised, however, condensation can form between the panes and mold can grow there.
Contact a professional glazier. The only process recognized by the National Association of Certified Home Inspectors (NACHI) must be done by a professional glazier. The process is controversial and there is considerable debate among NACHI members as to its efficacy or long term cost-effectiveness.
Drill a hole in an inconspicuous corner of the glass. This process requires professional equipment not available to the homeowner and must be done by a professional window glazier. A small hole is drilled in a corner to provide access to the space between the panes.
Spray a cleaning solution between the window pains. Once the window is breached, the glazier attaches a sprayer and sprays a cleaning solution mist through the hole into the pains. The solution will include an anti-fungal chemical that kills and loosens the mold.
Vacuum out the solution and moisture trapped between the panes. The glazier attaches a vacuum device to the hole and sucks out the cleaning solution, debris and as much moisture as possible.
Attach the defogger device. The glazier then permanently inserts a defogger device into the hole in the window that allows the release of moisture during thermal pumping. The device will remain attached to the window permanently to prevent condensation.