The process varies depending on the motherboard model, but generally:
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Windows can’t directly “clean” CMOS because CMOS is powered independently (by that battery). Use or CPU-Z to view BIOS version/settings, but not modify. The process varies depending on the motherboard model,
A is a specialized utility or physical technique designed to reset a computer's BIOS or UEFI settings to their factory defaults. This is most often used to bypass lost BIOS passwords, fix system instability caused by unstable overclocks, or resolve boot-loop issues. What is PC CMOS Cleaner? pc cmos cleaner