How to Fix bumper. fix scratches on the car: How to remove scratches from a bumper easily and quickly - how to fix scratches on the bumper at home\rbryou can use this method. Only you have to use the soft side of a sponge polishing! It will require more time, but will save Teflon coating. If your car is not white will be well after the removal of scratches on the surface apply any polish. This will protect the surface in the future.\rbr\rbrFirst, try using a softer method of WD 40 or regular gasoline.