How to clean the mainline of a sandbox

Hi All, I am trying to import a project package in an existing Mendix Team Server of a sandbox, but this fails because the mainline is not empty. I don’t know how to clean the main line of a sandbox environment. Does anyone know? Running the demo on our licenced test or acceptance environments is not an option as they are meant for technical and acceptance tests and not for demo's.  Thanks! Martin
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