Cleaning past installs

[William Frick]

I can't find the original source but I recall there was a simple command to
remove old kernels etcetera so they don't get picked up by grub as boot
options.  Also as a housekeeping measure prior to upgrading to the latest
(15.04) when the time comes.

I recall it was something like sudo apt-get clean .....

Suggestions anyone ?
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