A Sitecore package with a Post Deploy action to delete sample Items from the Content Tree.
The following items have been configured to be deleted from the master database:
{110D559F-DEA5-42EA-9C1C-8A5DF7E70EF9}/sitecore/content/Home{4D8A1C4D-1351-4DD1-A502-0660F01FEDC7}/sitecore/media library/Default Website{14030E9F-CE92-49C6-AD87-7D49B50E42EA}/sitecore/layout/Layouts/Sample Layout{1936B96E-DA1F-4A3A-8AAF-8C46268E2D84}/sitecore/layout/Renderings/Sample{9EB73C4C-1AF7-47C7-85B8-93E08176D4D2}/sitecore/layout/Sublayouts/Sample Datasource Sublayout{CE4ADCFB-7990-4980-83FB-A00C1E3673DB}/sitecore/layout/Sublayouts/Sample Inner Sublayout{885B8314-7D8C-4CBB-8000-01421EA8F406}/sitecore/layout/Sublayouts/Sample Sublayout{8AE1C245-A4FA-46AE-9B35-4FBC15F63169}/sitecore/layout/Placeholder Settings/content{73BAECEB-744D-4D4A-A7A5-7A935638643F}/sitecore/templates/Sample{A5BC37E7-ED96-4C1E-8590-A26E64DB55EA}/sitecore/system/Workflows/Sample Workflow
You can read more in this blog post: https://jammykam.wordpress.com/2016/11/14/sitecore-cleanslate/