Malware Cleaner 503 Recovery
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Use these steps only if the site became unavailable immediately after a plugin update.

1. Open the hosting File Manager and enable hidden files.
2. Delete the WordPress root .maintenance file if it exists.
3. Open the WordPress root .htaccess file and remove only blocks between:
   # BEGIN Malware Cleaner ...
   # END Malware Cleaner ...
4. If the host quarantined or permission-blocked a file inside the plugin folder,
   delete the whole wp-content/plugins/malware-cleaner folder before reinstalling.
5. Upload and extract the latest Malware Cleaner package.
6. If the site is still unavailable, temporarily rename:
   wp-content/plugins/malware-cleaner
   to:
   wp-content/plugins/malware-cleaner-disabled
7. Reload WordPress, restore the canonical folder name, then activate the latest plugin.

Do not delete the WordPress database or Malware Cleaner options. Version 15.4.21
keeps the WordPress header in a small malware-cleaner.php loader and all plugin
features inside the standard includes/mswp-runtime.php application file.
It automatically cleans up only
Malware Cleaner managed .htaccess blocks during upgrade or deactivation.
