Right, we all know this can happen on a window & it goes all cloudy/misty between the panes of glass. Over the years I've had to point this out to customers when they think I've not cleaned it properly etc. BUT... Over the past few weeks I've started to get paranoid. A few months ago, I switched a few houses that'd I'd been tradding over to WFP. One woman said the seal had gone in one window & asked if it could've been caused by the change to WFP. To which I politely said no way. Since then, especially the past few weeks, I've started to notice a lot more of my customers windows where the seal has gone and they're cloudy in between the glass. At first I thought I was just noticing them more since she had mentioned it. But today, I noticed at least 5 windows on different houses where seal had gone...and I'm pretty sure it wasn't before. I must have noticed more than a dozen over the past few weeks. I'm starting to get very worried. It can't be me can it?? It's only a soft brush...anyone else had a problem like this or even heard of WFP causing this?? Please help, thanks.