Ummm … guys … I can’t find anyone who’s posted this here yet but:
Model Cleanup - Deleting Views
About Aug 2017, @Andy_Grout posted regarding a model cleanup complete with choices running in the Dynamo Player.
I’ve also created & use this Purge All graph: 
This graph uses the Orchid package 202.4.2 or newer. Developed in Dynamo 2.0.
[edit] Missed listing @erfajo 's post, it is another example of purging. His post is for purging excess files from a directory though (ie: RevitFile.0001.rfa). I’m still learning.
Hope this helps.