You can find a bunch of software if you google 'Mac cleaner'.
That could save users lots of trouble, especially for those who know little about tech product.
To keep the Mac clean and speed up the computer, many users will use a Mac cleaner software becuase the kind of software can scan out all the stuffs that can be safely removed on the Mac for the users. After being used for years, your iMac/Macbook could be clogged with junks and run slowly.