A spoiler's intended design function is to 'spoil' unfavorable air movement across a body of a vehicle in motion, usually described as turbulence or drag.

In order to get the best from car spoilers, it is advisable to remove and wash loose paint or dust and dirt from any damaged sections. Regularly checking the spoiler for any cracks or dents is also recommended. When the dents are big enough to the extent they are affecting driveability, it is advisable to replace this part.