the product on the affected area and wipe it clean.
Nothing to do with tar stains
You have black streaks on the underside of your car that look very ugly. This is caused by the tar that covers the road. Tar stains can be removed by rubbing, but this takes time.
Instead of spending hours removing tar stains, use WD-40 to remove them: spray WD-40 on the affected area, leave it on for a few minutes, and then wipe it off without leaving a trace.
Waterproof outdoor chalk
If you’re
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