Do u live in an area that gets a lot of snow? Sometimes the chemicals they add to the salt they put on roads can do that... Don't know if that's what happened in your case or not. A pressure washer should take it off though.
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’01 TJ – 4.0L, 6cyl, 5 speed, 3.5” Rubicon Express Lift, 33” Nitto Trail Grapplers, Pro Comp Type 98 Steel Wheels Flat Black, Rubicon Express Adjustable Track Bar, ZJ Tie Rod Conversion