I m assuming that this is glue that has softened and leaked down.
Glue around window frame of door is running out.
Sometimes an adhesive residue is left on the steel.
How to drill into metal window frames to hang curtains.
This video show how to remove adhesive from 3m tape without using any chemicals.
How to reseal the glass in an exterior steel entry door.
If you have noticed that the glass in your shower door is coming away from the metal frame it is important to fix the problem immediately.
The panels on the door are splitting at the glue joints and the rails and stiles are also beginning to come loose.
Over time polyurethane sealant and glazing putty used to seal the glass in an exterior steel door can succumb to the effects of the outdoors.
Have tried goo is gone and other types of cleaners to no avail.
A do it yourself homeowner may abandon the idea of hanging curtains on a steel or aluminum window frame because it calls for drilling holes.
There are many products you can use to successfully remove adhesive from steel doors without damaging protective coating.
Tags and plastic film adhesive can be difficult to remove from steel doors especially if they have been in high temperatures.
This is probably happening because they installed a storm door and the sunlight combined with a southern exposure and humidity the client said that at one point condensation was so bad that water was collecting and running out.
I ve cut the excess and painted but over time the stuff begins to expand out again.
Once the glass comes loose from the metal frame and once the adhesive releases its grip the glass will continue to detach from the frame.
What is otherwise a nice looking door this wooden with a plastic overlay gets the heat of the intense morning sun in nevada.
Questions please ask on the comment section.