1. Type or paste C:\Users\YOURUSERNAME\AppData\Local\Spotify\ into the directory bar of Windows Explorer. Delete the Browser, Storage, and Data folders.
2. Type or paste C:\Users\YOURUSERNAME\AppData\Roaming\Spotify\ into the directory bar of Windows Explorer. Inside this folder, look for a file called prefs. Open this file in Wordpad and add storage.size=1024 on a new line at the end of the file. Save this file. This should limit the size of Spotify’s cache to 1024MB or 1GB; feel free to change the “1024” value if you would like the decrease or increase the size of the cache.