Editing Openai/69587609-f848-8011-8fb6-31957ff00716 (section)

===== Why this fits what you’re seeing =====
* Bright orange / rust color → very common with iron-rich clay soils (Southern California has a lot of this).
* Only on one wheel + running board → you likely drove through one puddle, curbside runoff, or construction splash that hit just that corner.
* Stubborn AF → clay + iron oxides bond mechanically to textured plastics and rubber. Iron-X won’t help much because it’s not brake dust; Bar Keepers Friend barely works because the surface is textured.
* Recent nonstop rain → rain washes soil fines + iron into the street, where one tire throws it upward like a slurry.

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