Cleaning out a storage shed involves several steps. First, it is important to remove all items stored inside the shed. Take out any large furniture, boxes, or equipment and place them outside. Sort through the items and decide what to keep, donate, sell, or throw away.Once everything has been removed from the shed, it's time to clean the interior. Start by sweeping or vacuuming the floors to remove dirt, dust, and debris. Use a broom or a brush to remove cobwebs from the corners and ceiling.