How to delete theme with all content?

I think I'm not the only one to reverse-engineer and learn gridbox from ready pages and themes -- one thing I can't find is the instructions on how, after installing and playing with a theme (note: when installing the theme, if available, it installs pages, blog, shop, etc.) remove the theme and all its components -- that includes the joomla menus, modules... I tried few methods abut I'm ending up deleting only partial (i.e. theme, or page section) -- am I to understand that if I want to remove all components installed with a theme I have to manually go one-by-one and remove it? if that's the case, I think this could use an improvement at some point. Thanks!!

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