There are many reasons why a janitor is so important they help prevent the spread of a illness or virus keep trash picked up keep everything clean and safe and  organized.                                                                                                                                                                                                                  Janitors and custodians are cleaning up after you so id say they are pretty important to your office schools and hospitals as they keep everything clean and safe for everyone else.                                                                                                                                                                                                        Janitors also help maintain floors weather it be stripping and waxing them buffing them or keeping carpets cleaned it is a vital job to keep somebodies invest last for many years. janitors also help with the security in buildings locking doors or whatever just there presence help with overall security.