Uninstall EWWW Image Optimizer (wp_postmeta)

Hello,

I would like to totally remove EWWW Image Optimizer from my website even if it’s a greaaaat plugin 🙂 (using now jpegmini standalone).
I have uninstalled the plugin, removed the folder, cleaning the wp_option database but for all my posts metadata I have some ewww_image_optimiser value everywhere like this:

a:6:{s:5:"width";i:460;s:6:"height";i:460;s:4:"file";s:20:"2015/01/IMG_3120.jpg";s:5:"sizes";a:5:{s:9:"thumbnail";a:5:{s:4:"file";s:20:"IMG_3120-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;s:9:"mime-type";s:10:"image/jpeg";s:20:"ewww_image_optimizer";s:51:"Reduced by 8.2% (835 B) - Previously Optimized";}s:6:"medium";a:5:{s:4:"file";s:20:"IMG_3120-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:20:"ewww_image_optimizer";s:52:"Reduced by 7.2% (2.4 kB) - Previously Optimized";}s:14:"shop_thumbnail";a:5:{s:4:"file";s:20:"IMG_3120-150x150.jpg";s:5:"width";i:150;s:6:"height";i:150;s:9:"mime-type";s:10:"image/jpeg";s:20:"ewww_image_optimizer";s:10:"No savings";}s:12:"shop_catalog";a:5:{s:4:"file";s:20:"IMG_3120-300x300.jpg";s:5:"width";i:300;s:6:"height";i:300;s:9:"mime-type";s:10:"image/jpeg";s:20:"ewww_image_optimizer";s:10:"No savings";}s:11:"shop_single";a:5:{s:4:"file";s:20:"IMG_3120-450x450.jpg";s:5:"width";i:450;s:6:"height";i:450;s:9:"mime-type";s:10:"image/jpeg";s:20:"ewww_image_optimizer";s:52:"Reduced by 6.4% (4.2 kB) - Previously Optimized";}}s:10:"image_meta";a:11:{s:8:"aperture";i:0;s:6:"credit";s:0:"";s:6:"camera";s:0:"";s:7:"caption";s:0:"";s:17:"created_timestamp";i:0;s:9:"copyright";s:0:"";s:12:"focal_length";i:0;s:3:"iso";i:0;s:13:"shutter_speed";i:0;s:5:"title";s:0:"";s:11:"orientation";i:1;}s:20:"ewww_image_optimizer";s:29:"Reduced by 6.3% (6.4 kB)";}

How I can automatically remove all those ewww_image_optimizer to clean the meta data (I have thousands of photos, so manually is not possible) ?

Thank you !

https://wordpress.org/plugins/ewww-image-optimizer/