Is Your Windows PC Slow? The 3 Best Free Cleanup Tools Compared
If you are reading this, chances are your PC has been feeling a bit sluggish lately, or you’re staring at those dreaded red storage bars because your drives are almost full.
When your computer slows down, it is usually time for a system cleanup. But with so many utility programs out there, which one should you choose?
In this guide, we are comparing three of the best tools available: the official Microsoft PC Manager, the newly updated open-source veteran BleachBit, and a rising open-source contender called Fluent Cleaner.
We put them to the test to see which one clears the most junk safely, quickly, and without headache. Let's dive in!
1. Microsoft PC Manager: The Safe and Official Choice
Microsoft PC Manager is an official tool developed by Microsoft. Because they made Windows, they know exactly where temporary junk files hide without accidentally deleting things that could crash your system.
Key Highlights:
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The Performance Test: Running a scan (excluding the recycle bin) revealed a massive 14 GB of cleanable files.
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Third-Party Support: It doesn't just clean Windows junk; it also targets temporary files from third-party applications like Node.js, Nvidia drivers, Epic Games, Firefox, PowerToys, and LM Studio.
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Safe Registry Cleaner: Usually, registry cleaners are risky. However, Microsoft PC Manager has a "Deep Uninstall" feature. When you remove a program, it safely tracks down and deletes that specific program's leftover registry entries. It is the only official, safe registry cleaner on the market.
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Extra Features: It functions as an all-in-one hub. It includes a RAM booster, startup app manager, large file finder, and a duplicate file finder.
Verdict: It is the safest, most straightforward tool for daily use. You don't need to tinker with any scary settings or worry about breaking your computer.
2. BleachBit 6: The Open-Source Classic
BleachBit is a completely free, open-source classic that is available for both Windows and Linux. It recently received a major update to version 6, bringing over 100 improvements and fixes.
Key Highlights:
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The Performance Test: Running a default scan (excluding the recycle bin) only cleared about 6 GB of files—less than half of what Microsoft PC Manager found.
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Multi-Drive Recycling: Unlike other tools, BleachBit excels at cleaning the recycle bins of all your connected drives, not just your main
C:drive. -
The "Expert Mode" Trap: BleachBit offers an Expert Mode, but it comes with warning labels. If you aren't careful, it can delete saved browser passwords.
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Warning on "Free Space Wiping": BleachBit has an option to "wipe free space" to prevent file recovery. However, doing this on Solid State Drives (SSDs) contributes to drive wear and tear, meaning frequent use can actually degrade your hardware over time.
Verdict: While BleachBit is highly respected and excellent for cross-platform Linux/Windows users, its default scan is less aggressive, and its advanced features require extra caution.
3. Fluent Cleaner: The Modern Underdog
If you are looking for an open-source alternative to CCleaner, Fluent Cleaner is a fantastic project hosted on GitHub. It uses a community-driven database to target system clutter.
Key Highlights:
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The Performance Test: Excluding the recycle bin, Fluent Cleaner found 12 GB of junk—very close to Microsoft PC Manager!
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Community-Powered (WinApp2 & WinApp3): It utilizes WinApp2.ini, a massive community database of rules for cleaning up thousands of apps. It also has an experimental WinApp3 mode, though it's more aggressive and should be used at your own risk.
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Finding the Hidden Leftovers: Fluent Cleaner managed to find junk files that Microsoft PC Manager actually missed, such as old Nvidia update files, Microsoft Outlook cache, and old Steam installers (Steam often leaves game installers behind even after your game is fully downloaded).
Verdict: An incredibly powerful, beautiful, and transparent open-source tool that punches well above its weight class.
The Ultimate Two-Tool Strategy
So, which one should you use? After testing, the best setup isn't choosing just one—it's using a smart combination of two tools:
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Your Daily Driver: Microsoft PC Manager Keep this as your main utility. It is completely safe, officially supported, requires zero configuration, and features a one-click RAM booster and safe registry cleaning.
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The Deep Clean Specialist: Fluent Cleaner Once a month, run Fluent Cleaner to catch the heavy-duty leftovers (like Steam game installers and Nvidia update archives) that Microsoft's tool leaves behind.
By combining these two, you can safely breathe new life into your Windows system, free up gigabytes of valuable SSD space, and keep your computer running like new!
I’ve also made a video on this topic — you can watch it below.
Check out my other posts, I post useful tutorials and tech tips, maybe you will find something useful 😉.