The latest updates from MS introduced a new option in the disk cleanup dialogue. It enables you do get lost of the unnecessary files from previous updates and only was available via some extra tools before. Now this wasn't really newsworthy but I could get rid of over 6gb on my small laptop SSD which is quite the gain.
See this example shot of where the option is. That's after cleaning of course, so perhaps check how much free HDD/SSD space is available for you. Note. It might need a reboot to really show up as new free space. That reboot will also feature the 'don't turn your PC off' screen for a second, so I guess it's really cleaning up.
After cleaning, you could purchase even more addons, right? Just saying. B)