How can I configure ReSharper's code cleanup on save?

Question

I would love to configure Visual Studio/ReSharper to run \"Code cleanup\" whenever I save a file.

A bonus would be to configure this only for C# files, as I sometime

Answer 1

In version 2020.2+ of R# there is now build in option to run cleanup on save:

Resharper Options > Code Editing > Code Cleanup > General