Janos Moga

This plugin provides lightweight securtiy enhancements to secure your WordPress website. However, this is not a security plugin––most of securtiy enhancements should be made on server level.
Following security enhancements are available: 
* Setting up security headers. 
* Disabling XML-RPC
The plugin also includes functions to clean code output.
Following cleaning enhancements are available: 
* Removing WordPress default SVGs.

Hardened Clean

Lightweight protection to and cleaning of your Wordpress website.

thaikolja

Thumbnails Cleaner helps you keep your WordPress installation tidy by removing and regenerating thumbnails.
You can control all functions through the plugins’ main page found under “Tools”. You can:
<ul>
<li>Analyze your uploads directory, giving you an overview how many original files and thumbnails there are.</li>
<li>Clean thumbnails which means deleting them while keeping the original files.</li>
<li>Restore thumbnails to start out with a clean uploads directory. This function requires the plugin <a href="https://wordpress.org/plugins/regenerate-thumbnails/" rel="ugc">Regenerate Thumbnails</a>.</li>
<li>Create backups of your uploads directory to keep your files safe in the unlikely event that there is a problem.</li>
<li>Restore backups in case you have lost a file that was not supposed to be deleted.</li>
</ul>
Please see the <a href="https://www.koljanolte.com/wordpress/plugins/thumbnail-cleaner/documentation/" rel="nofollow ugc">official website</a> for a full 
documentation.

Thumbnail Cleaner

Cleans up your WordPress installation by removing and regenerating thumbnails.

Hardened Clean vs Thumbnail Cleaner