A show desktop icon on unity launcher by default will solve the problem to some extent as it will minimize all active windows in one click and bring focus on a clean desktop. There is a keyboard shortcut alt+ctrl+d that does the same thing but not everyone is used to keyboard shortcuts. But this is not ideal solution if one wants to minimize one/multiple instances of only one app (e.g nautilus) and not all.
A show desktop icon on unity launcher by default will solve the problem to some extent as it will minimize all active windows in one click and bring focus on a clean desktop. There is a keyboard shortcut alt+ctrl+d that does the same thing but not everyone is used to keyboard shortcuts. But this is not ideal solution if one wants to minimize one/multiple instances of only one app (e.g nautilus) and not all.