Rulesets, insights or patterns can be removed by clicking the little trash icon behind the name of the element in the respective overviews. But be aware that you will only be allowed to delete your own elements. Not those of others.
On deletion of a ruleset or Insight you will be prompted to indicate whether you want to also delete all sub elements (insights & patterns) as well. Be careful when doing this as underlying insights and patterns might be used in multiple rulesets and insights and deleting them will result in them being removed from those as well. If unsure it is better to eliminate the elements starting at deleting the patterns first, then the insights and then the ruleset. As the view always shows in which element it is being used this will allow you to selectively remove obsolete elements.
Insights and patterns not included in either an insight or a ruleset will have an icon (broken link icon) indicating this. Rulesets and insights not containing any sub elements will also have an indicator (empty folder icon). These indications can help you determine what elements are and are not being referenced and can be cleaned up.
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