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A standard upgrade preserves old logs, corrupted preferences, and hidden launch daemons. A from a fresh DMG:

Do you already have a prepared for this process? Share public link Boot from USB: Restart your Mac and immediately

Ensure all your data is backed up, as a clean install erases your drive. Boot from USB: Restart your Mac and immediately hold the Option (⌥) key. Select the USB installer from the boot menu. Erase Drive: Once in Recovery Mode, select Disk Utility , choose your main internal drive, and click (Format as and Scheme as GUID Partition Map Exit Disk Utility and select Install macOS . Follow the prompts to install a fresh copy of Catalina. Important Compatibility Note macOS Catalina was the first version to drop support for 32-bit apps Follow the prompts to install a fresh copy of Catalina

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Your Mac will now begin copying files and setting up the system. This process can take anywhere from 15 to 45 minutes depending on your hardware speed. Your Mac will restart automatically during this process—leave the USB drive plugged in until you are greeted by the welcome setup assistant screen. select Disk Utility