Remove webp files

Hi,

Great plugin indeed! However, I used the plugin Enable Media Replace to replace media without having to upload a new image. For these images, the website is still returning the .webp of the original file (before being replaced). I’ve tried to Bulk optimize again and even deleting the Converter for media plugin, deleting the cache… And still, the website shows the old webp image. How to clean everything and start the process all over again please? Thank you!