I'm running Debian 9 and I've installed several packages, which probably left behind other packages and configuration files (and general clutter).
I've already run
apt autoremove --purge and
apt clean, and used Synaptic to find any orphaned packages.
I do notice that Debian uses about 50 - 100MB in terms of RAM than before. I'm sure there are a TON of dependency and random library packages left over from when I installed some dev stuff to compile projects.
Any suggestions? The closest thing I can think of is CCleaner or whatever it's called, but it's not on Linux and the alternative doesn't seem to remove left over packages.