Is this 3rd stage corrosion, or something else?

[Frozone]

Idk if its noticeable in the pictures

[Jewbacca]

Hard to tell, but it looks more like a busted seal to me. If it’s actually on the outside of the glass I’d say it is hard water staining.

[Henry]

That is the first question. Side 1,2,3, or 4? It is all about the questions.

Henry

[Frozone]

@Jewbacca

Hard to tell, but it looks more like a busted seal to me. If it’s actually on the outside of the glass I’d say it is hard water staining.

I know it’s hard water staining, because I’ve removed it before.

@Henry

That is the first question. Side 1,2,3, or 4? It is all about the questions.

Henry

Surface 1? It’s on the exterior accessible surface.