It is recognized that a nonconforming use may have several distinct accessory aspects; i.e., that one commercial or industrial nonconforming use may include uses such as offices, clerical and managerial, sales (either wholesale or retail), storage, distribution or production as accessory uses. A use shall not be considered abandoned for purposes of this chapter unless the primary use (i.e., production or sales) and all accessory uses, i.e., office/clerical, storage, sales or production (as appropriate) have ceased on the site for the required period of time.