In a new construction home, when we moved in there is this residue on the interior window framing. This is not spray insulation, but looks like there was some type of foam on the windows itself during shipping (?)
We've tried several things to get this gunk off - goof off, goo gone, acetone, etc.
The builder at one point said they might have to just replace the windows or try some special type of paint. I don't think they are going to come through on this.
See the photo below. There was some actual foam there at some point we mostly scrapped off - if I recall correctly, it was more like upholstery foam then some construction foam in touch and appearance. We also see this in a few other spots on this set of windows, but this is the biggest, uggliest area.