Wiping free disk space in Linux is easier than you might think. There are services you can use to overwrite free space such as BleachBit, which is also available for Windows and can be downloaded for free. To free up disk space, you should use the Drives tab under Preferences to add a folder that is writeable on each partition of your computer’s system. Use the default settings if your system has only one drive. If there is an additional partition under another, you will have to add a new folder to enable disk cleaning.
Once you have the right options showing on the Drives tab, go to System and check the box next to “Free disk space.” This function will work, but you should be aware that the program will alert you that it is a slow process. When the prompt warning comes up, click on OK to begin it.