Any good registry cleaner available for Windows 11/10?

B1eachBit is indeed a free and open-source registry cleaner that can help with various cleaning tasks on Windows 11, including clearing cache, temporary files, and some registry entries. 

B1eachBit for Registry Cleaning:
Functionality: B1eachBit can clean certain obsolete or invalid registry entries, but it is not specifically designed as a comprehensive registry cleaner.
Safety: It's generally safe, especially since it's open-source and well-maintained, but as with all registry cleaning tools, caution is advised.
Ease of Use: Its interface is straightforward, but it might not provide as detailed or targeted registry cleaning options as specialized tools.

While B1eachBit is a good tool for general cleaning and privacy protection, for dedicated registry cleaning, I recommend a specialized registry cleaner. If you decide to try B1eachBit, do so cautiously and ensure you review what it plans to clean before proceeding.