The bottom of my ranger when the carpet is out has that textured fiberglass stipple and it doesn't clean up very well.

I Cleaned the floor regular dawn detergent and then some peroxide to try to bleach it out to get it clean. Still wouldn't whiten up. Used the magic eraser on the right side for a before and after comparison.

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Then I used the Great Value eraser on the left side to see how it fared and it did just as good a job.

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Wish it would get all the way down into the crevices, but I'm happy with results.