[Haskell-cafe] Cleanup obsolete stack stuff (compiler, libraries, etc.)

Hi folks! I want to perform some cleanup deleting obsolete compilers located in ~/.stack folder. I know stack places them into ~/.stack/programs/<platform>/ directory, however I think there are also should be something else related, e.g. docs and libs, and especially packages that was built when I used old LTS snapshots. What is the best way to perform such cleanup?