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OpenClean is a free, open-source system cleaning utility for Windows, published by DaonWare and currently available in version 1.3.0 across a total of three released versions. Positioned within the system maintenance and PC optimization category, the software is designed to give users an honest, transparent picture of their Windows computer and to remove only the items the user explicitly selects. Its cleaning capabilities cover temporary files, caches, startup entries, duplicate files, and other common sources of clutter, making it suitable for routine disk cleanup, startup management, and general system tidying on desktops and laptops. A defining characteristic of OpenClean is its rejection of practices common in the cleaner software market: it makes no claims of fake speed boosts, invents no problems to pressure users, requires no account, installs no background service, and collects no telemetry. Every figure displayed in the interface is described as a real measurement rather than an estimate or marketing number, which supports informed decision-making about what to delete. Typical use cases include reclaiming disk space from accumulated temporary data and caches, reviewing and trimming startup entries to control what loads with Windows, and locating duplicate files that waste storage. Because it is distributed as free and open-source software, its code can be inspected and verified by anyone, which aligns with its emphasis on honesty and user control. OpenClean is also offered as a portable single-file build that runs directly from a USB stick, requiring no installation and no .NET runtime, which makes it practical for technicians, support staff, and users who need a trustworthy cleaning tool on multiple machines or on systems where installing software is undesirable or not permitted.
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