Clear the NuGet cache: dotnet nuget locals all --clear

dotnet nuget locals all --clear deletes every local NuGet cache: the global packages folder (where restored packages live), the HTTP cache (downloaded package metadata and .nupkg files), the temp folder and the plugins cache. The next dotnet restore downloads everything again. Clear only the cache you need when possible, for example http-cache when a newly published package version is not found.

List and clear

dotnet nuget locals all --list | cut -d: -f1
dotnet nuget locals http-cache --clear | grep -v '^Clearing'

http-cache
global-packages
temp
plugins-cache
Local resources cleared.

--list prints each cache name and its path (the paths are omitted above because they depend on the machine). Typical locations:

The NUGET_PACKAGES environment variable or the globalPackagesFolder setting in nuget.config move the global packages folder (NUGET_HTTP_CACHE_PATH, NUGET_SCRATCH and NUGET_PLUGINS_CACHE_PATH move the others); dotnet nuget locals global-packages --list always shows the effective path.

Which cache to clear

With nuget.exe the same operations are nuget locals all -clear and nuget locals all -list. In Visual Studio: Tools > Options > NuGet Package Manager > Clear All NuGet Cache(s).