What’s the safest way to find and clean 600 GB in AppDataLocal?

600 GB in AppDataLocal is extremely unusual, so the exact folder matters. It could be a game, browser cache, development files, or downloaded local AI models. Once you locate the largest item, identify which program created it before removing anything.

The contents of AppData are often application data rather than disposable junk. Temporary files under AppDataLocalTemp are generally safe to remove, although files currently in use may not delete. For anything else, close the related program and use its built-in cache or storage cleanup option.

If the storage usage comes from many unrelated applications and you can’t determine what is safe, back up your documents and export important browser and application settings first. Creating a fresh Windows user profile can be safer than randomly deleting AppData, but verify that everything works before removing the old profile.

First find out exactly where the space is going. Tools such as WizTree or WinDirStat can scan the drive and show the largest folders and files. Don’t delete the whole directory—check the specific application or cache responsible, then follow that app’s cleanup instructions.