BleachBit is an open-source system cleaning tool that helps users enhance disk capacity by removing unnecessary files and improving privacy. It permanently deletes files to prevent recovery, making it suitable for users handling sensitive information. The tool offers features such as shredding unused disk space, clearing browser histories, and removing software logs. BleachBit is free to use, lightweight, and compatible with various operating systems, including Windows, Linux, and macOS (with limited functionality). It supports cleaning for multiple applications and provides command-line functionality for advanced users. Additionally, BleachBit can be run from a USB drive without installation. Alternatives to BleachBit include CCleaner, Advanced SystemCare, and DaisyDisk, each offering different functionalities and features.