Had my car professionally detailed about 8 days ago. I have washed it twice since - 2 days ago and today.
I did not notice this 2 days ago, so I don't think it was somehow left behind my the detailer. But I can't be 100% certain on that. Either way, I have not idea what it is or how to get rid of it.
I have tried 2 different tar/bug removers and also a product called Goof Off. Goof Off has never failed me before (for non car stuff) - will remove almost anything off of anything. Did not make a dent on this.
It looks like I could scratch it off (maybe), but that is about the last thing I want to try.