Removing all dependencies with aptitude

[Vasco Costa <vasco.costa@geekslot.com>]

Most of the times 'aptitude remove/purge package' removes ALL the unused
dependencies of the package.

Sometimes however, even if I issue this command RIGHT after having
installed a package it only removes some of the dependencies, leaving a
few behind (specially for packages with huge dependency chains).

Why does this happen? Is this because some of the installed dependencies
may be optional dependencies for packages already installed or is this
some aptitude limitation?

Is there a way to remove ALL the unused dependencies in these cases
without manually issuing a remove for each of them?

Thanks.

-- 
Vasco Costa