I believe that due to poor gluing of the rubber to the window and/or probably other reasons that I'm not aware, mold has started to "dance" inside the window and probably window frame as well..., at the top and bottom there are two holes, a weird smell comes out of it, I'm thinking of somehow flooding from top with some kind of liquid in order to get rid of this smell.
Windows are washed about once a month usually, but this summer someone was a bit lazy..., I've also recently found out that pvc windows require some special treatment every 6 months or so, we haven't done anything special nor did we know about that up until recently.
Any thoughts and/or suggestions are highly appreciated!!
- windows are ~10 years old