While getting out of the car my sneekers keep hitting..and leaving black marks on the drivers door just under speaker. I have the light colored interior. I have tried some plastic stick on "furniture protectors" but nothing sticks to the door panel material. Any after market or home brew fix for this "Problem"?

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1999 E300 TurboDiesel
2007 Ford Explorer limited
1981 John Deere 650 Diesel tractor