http://y7yea4pmqqtznb33qiugvysyn2bob5v62e4pvoadoibrwkq3tsddjeyd.onion/zh-hans/module/how-delete-your-data-securely-windows
Read the details about each preset closely before using it, and click the "Preview" button to get a closer look at exactly what BleachBit will delete. If you're not sure what something is or what it does, like some of the System settings, do not shred those files. With that in mind, let's use Google Chrome as an example of how this works.