Out of warranty T5442T-ZE issues - lens cover

[d5775927]

I have T5442T-ZE mounted on a pole on my yard, unprotected from the elements, it works well for a few years.
Recently, I saw the lens is dirty, today, I went to clean it.
While cleaning, I noticed that the lens cover is about to fall, probably the glue/sealant got damaged overtime.
This is the only issue I have with the camera, what should I do to fix it ? (replacing the camera is not an option now, the lens issue is minor).

 

[JDreaming]

I will think some weather proof clear glass/phone screen glue from Amazon will fix that problem.