Sure, I can guide you through the steps on how to clean up and organize your Spotify playlists.

1. **Delete Unwanted Playlists**: To delete a playlist, simply right-click on the playlist you want to delete and select "Delete Playlist". Be careful with this step, as deleting a playlist is permanent and cannot be undone.

2. **Rearrange Playlists**: You can rearrange your playlists by clicking and dragging them to your desired order in the sidebar.

3. **Create Folders for Playlists**: To further organize your playlists, you can create folders. To do this, go to "File" > "New Playlist Folder" or use the shortcut (Ctrl + Shift + N for Windows, Command + Shift + N for Mac). You can then drag and drop your playlists into these folders.

4. **Sort Songs within Playlists**: Within a playlist, you can sort songs by title, artist, album, date added, and more. Simply click on the corresponding column header to sort. Click again to reverse the sort order.

5. **Remove Duplicate Songs**: Spotify doesn't automatically remove duplicate songs from playlists, so you'll have to do this manually. Scan through your playlist and if you see any duplicates, right-click on the song and select "Remove from this Playlist".

6. **Use Playlist Description**: You can add a description to your playlist to remind you of its purpose or mood. To do this, click on the playlist title, then click again on the description field that appears below it.

Remember, it's your music library, so organize it in a way that makes the most sense to you and enhances your listening experience.