All,
The black window and door trim on my two-year old Model Y started doing that all over a few months ago.
It looks to me like the oily, iridescent film that one sees on substandard or recycled rubber or plastic products from China as they decompose our outgas.
I've never washed it with anything harsh or abrasive at all. The vehicle isn't garaged, so there has been almost two years of sun exposure.
I think this is from the trim and/or whatever paint they use on it (if any?) decomposing. If one wipes one's finger on it, it comes off, only to be replaced with a fresh layer of film hours or a day later. Same thing if one wipes it off with alcohol and a soft cloth....just comes back hours later or the next day.
Photos attached.
Does anyone know if the trim is metal or plastic? Painted or unpainted?
R,
BP