How to remove stuff on window frames

[filter]

On my 2002 Highlander, this stuff:

is on the window frames. (See the attached picture) Does anybody know what it is and what can safely get it off? I ddn't want to scrub or use any chemicals until I knew that I wouldn't hurt the window trim.

Thanks

[TrailDust]

Looks to me like the anodized black is coming off the frame. You need to repaint it.

[MothersPolish]

Hard to tell from this angle, but if I'm not mistaken, it's the rubber coating that has oxidized, revealing the metal below it.

On some other Toyota vehicles, it is a bright stainless that is exposed as the rubber coating wears away, and I have seen this on roll-up/roll-down windows of various Camry and Sequoia models.

Replacement is really the only way to address this properly.