How to clear cache on your iPhone in Safari?

Go to Settings ➜ Safari ➜ Clear History & Website Data

How to check the storage on your iPhone and iPad - Apple Support - "About cached files in Other ... When you stream music or video, that content is stored as cached files on your device so you can quickly access it again. Your device automatically removes cached files and temporary files when your device needs more space." "You don't need to delete them yourself." (Which I interpret to mean you cannot delete them directly yourself.)