To clear the cache on YouTube, the method depends on the device and platform you are using: On Android devices:

1. Open Settings on your device.
2. Go to Apps or App Manager and find YouTube.
3. Select Storage & cache.
4. Tap Clear cache to remove temporary files without deleting app data.

On iPhone:
iOS does not provide a direct cache clearing option for YouTube. The best way is to delete the YouTube app and then reinstall it:

1. Press and hold the YouTube app icon and select Remove the App to delete it.
2. Reinstall YouTube from the App Store.
   Alternatively, you can offload the app in Settings > General > iPhone Storage

YouTube > Offload App, which frees storage but retains user data, though it does not fully clear cache.

On Desktop (depending on browser):
YouTube cache is part of your browser cache, so clearing browser cache will clear YouTube cache:

• In Chrome, click the three dots > Clear browsing data > choose Time range (e.g., All time) > check Cached images and files > Clear data.
• In Safari, go to Safari > Preferences > Advanced tab > enable Develop menu > Develop > Empty Caches.

Clearing the YouTube cache can help fix playback issues, free up space on mobile devices, and improve app performance, but note that clearing cache will temporarily slow the app as it rebuilds cache data.

This complete guide covers Android, iPhone, and desktop browsers for clearing YouTube cache effectively.