Abstract: The invention is a clean-out apparatus for use in a trailer of the type having a reciprocating floor conveyor system for conveying and unloading large quantities of granular material. The clean-out apparatus is designed to minimize the residual granular material that remains on the reciprocating floor of the truck after the floor is reciprocated to unload the granular material. The clean-out apparatus comprises a reel adapted for rotatable support from the trailer, adjacent the forward end wall thereof, and a flexible clean-out cover movable from a first retracted position where it is coiled around the reel to a second uncoiled extended position adjacent the rear door opening. Importantly, when the clean-out cover is in the first retracted position, it is disposed such that a portion thereof extends over the reciprocating floor, under a portion of the granular material adjacent the forward end wall of the trailer.