Reinstall MongoDB to fix bugs (guidance request)

I tried to run telescope with my app and now none of my collections show with show collections in meteor mongo while user collection appears to follow a schema from telescope after I have rolled back to previous commit: MongoDB nuked; didn't work: meteor reset, commit rollback, delete local files

How do I obliterate MongoDB without a trace or at least uninstall it and than reinstall since I’ve already tried deleting local in .meteor and db.drop()ish in meteor mongo.