Office 2016 is out, but I noticed that the latest version of CCleaner does not clear the documents or folders for this latest software suite.
my guess is Office 2016 is 2 days old while the latest version of CC (v5.09.5343), released 25 Aug, is almost a month old.
but there should be the next CC version due out very soon - if the devs have enough lead time, maybe you'll see Office 2016 included in it, or the next.
do you have Office 2016 as a standalone install or part of the Office 365 subscription service?