It is not possible to completely clean up the junk files of Bilibili iOS client through "My-Settings-Cache Settings".

You can try: Uninstall the APP - Restart the device - Reinstall the APP. Press and hold the desktop icon to delete the Bilibili iOS client; wait for a few minutes (waiting for the system to delete files in the background), restart the phone; enter the App Store to reinstall Bilibili.

So far, Bilibili has not fixed the bug that the iOS APP web page cache and video cache cannot be cleared.

This will cause the app to grow indefinitely until it completely fills up your device's storage space.