If you care about slow tmp leaks, you could also just use a 1-line, decade+ old solution; no additional software required, since your machine already has cron, find and xargs on it:

https://askubuntu.com/questions/431058/using-a-cronjob-to-cl...

If you miss that "will this eat my system?" adrenaline rush you get from systemd-tmpfiles, you could just use cron + find, but replace xargs with the -delete option.