How do you delete obsolete Competitors?

How do you delete obsolete Competitors?

I have been doing some testing to establish some best practices and procedures for using the Competitor's Section of  a Potential. For the sake of expediency I created fictitious competitors. However, now that my testing is complete I want to remove these companies form the list to avoid confusion.

I have searched the User Guide and I cannot find a way to do this.

Does anybody have an answer?