Double Pane Windows

I owned an 01 Itasca Sunflyer and wanted to know if someone has experienced any moisture or condensation accumulated between double pane glass window at the front of driver side door or any of the windows. I know there is some sort of a leak there, but nothing visible other than the moisture all over the glass. While I tried to reseal the outside seam around the glass, but with no sucess. One RV dealer told me that the inside glass can be broken using the porcelin from a spark plug tip and take care the leak from the inside. I thought this is a crazy idea, but wanted your opinion.
Thanks in advance.

This is not an uncommon problem but the answer you received sure is an uncommon one to me. We have the same problem with our Tiffin motorhome and take it back to the Tiffin plant and they replace the windows for us at no charge. Depending on where you live or travel I would venture to guess your manufacturer would do the same for you if you would contact them and go to their plant.