Microsoft выпустила утилиту для удаления .NET Core. Это может быть полезно, если у вас накопилось довольно больше количество различных версий runtime и sdk, которые более не нужны.
https://betanews.com/2020/03/11/microsoft-net-core-uninstall-tool/
https://betanews.com/2020/03/11/microsoft-net-core-uninstall-tool/
BetaNews
Microsoft releases .NET Core Uninstall Tool for Windows and Mac
Microsoft has released a new tool that will please anyone who has been frustrated by the behavior of Visual Studio and its tendency to leave behind old versions of .NET Core SDKs and runtimes after an upgrade.