The primary source is BleachBit.org . Avoid unofficial "clone" sites that may bundle unwanted software.
You can choose between a standard installer or a portable edition that runs from a USB drive without installation. bleachbit free download
BleachBit is widely regarded as one of the most powerful free, open-source disk space cleaners and privacy managers available for Windows and Linux. Often called the "open-source alternative to CCleaner," it provides deep system cleaning without the bloat, ads, or "pro" versions common in commercial alternatives. The primary source is BleachBit