To clean up redirects (C++ redirects aka CoreRedirects or engine redirects) run the resavepackages commandlet.
"Drive:\YourEngineVersionOrSource\Engine\Binaries\Win64\UnrealEditor-Cmd.exe" "Drive:\YourProjectPath\YourProject.uproject" -run=resavepackages
To make it faster you can also use -NoShaderCompile -ProjectOnly
.
To fix asset redirectors you can add -fixupredirects
or use the content browser asset action.