Just noticed on my car what appears to be a light grey arch on my blue car paint. Looks like what would happen if there were hard water stains . Its faint, half non perfect wobbly circle. Paint above/below looks fine. I used some normal cleaner and went over it once and it appears to make it look fainter. I know what happens when the clear coat wears off since my spoiler is a mess and needs to be repainted. So I am pretty sure it is not that. Plus, that shape of this light grey line does not look like what happens when the clear coat wears off or if there is oxidation. There is no pealing and the area is smooth to the touch and no roughness.
Going to try and buff it out later and see if that removes the grey line. Tried taking a pic but it is to faint to get a good one.
Just seeing if someone had any ideas or if there is something I am not thinking of.