TIEro

This plugin is now available as part of <a href="https://wordpress.org/plugins/tietools-automatic-maintenance-kit/" title="TIEtools" rel="ugc">TIEtools</a>, which also includes post expiry and duplicate post control.
An extremely simple plugin which removes accumulated error log files from your web space. It is VERY important to note that the plugin does no checking or any complex stuff: it just removes error logs. Please read the FAQ before you activate this plugin.

TIElogremover

An extremely simple plugin which removes accumulated error log files from your web space.

Mario Peshev

Delete all Custom Field entries assigned to posts that do not exist in the posts table.
Navigate to Settings -> Remove Unused CFs and delete all postmeta for non-existing posts.

DX Remove Unused Custom Fields

Does exactly what it says.
Installed, navigate to the settings page, click "Delete" and Done! Cannot be easier than that.
Thank you!



Simply Awesome!

Delete the Custom Fields from your postmeta table where assigned posts no longer exist.

TIElogremover vs DX Remove Unused Custom Fields