There are a few things you can do to clean a body pillow if it has been used. First, remove all of the stuffing and put it in a garbage bag. Second, take off the cover and place it in a sink or toilet. Third, use a plunger to suction onto the filling and pull until all of the stuffing is removed. Fourth, use a vacuum cleaner to suck out any remaining stuffing and liquid. Finally, dry the pillow completely by placing it on an oven rack or in an air-tight container.