This tutorial is part of Build Xamarin project with Xamarin post. It assumes all projects have been build including Unit test projects. Another assumption is the use of Mac OSX to run all commands.
The NuGet command line tool (nuget.exe) does not contain a feature to delete local cache and packages but since is just a directory on your machine you can do this manually.
NuGet packages and cached files can be found here:
- Mac OS X
This tutorial will give you all the necessary steps to use Jenkins as a continuos integration tool with Xamarin (Android and iOS). If you already have a machine with all the tools installed (Xamarin Studio, XCode, etc) this guide should take you about 30 minutes at most to setup Jenkins running a simple job.