A couple of windows (single glazed sashes) have a thin irregular strip where the glass is white along the bottom edge.
I'm assuming this is the consequence of some over-enthusiastic blow gun stripping at some stage, but may be wrong.
Does anyone have a simple fix for this? I've tried rubbing but it seems to be more than superficial. I'd rather not have to replace the glass at the moment, as they will undergo major surgery inn due course (!)