Deleting images and thumbnails

I need to delete 100’s of images from products that have been retired from my website. If I delete them from the Media Library, will the thumbnails for those images be deleted too?

What is the best way to do this to make sure no thumbnails are left in the server?

• This topic was modified 5 years, 1 month ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic