How can I delete unused variables?

Just found this link and post.  I commented at a different locations where the Results#.ScorePoint and similar are confusing.  It just created another chaos in my testing file.  I imported a new quiz in my Scene 2 and by default the Result slide named the score Results.ScorePoint and replace the same variable in my first Quiz in Scene 1.  Now I have a series of Resuts#...... sitting in the system that I cannot delete according to the thread above.  And apparently I have to delete this Result slide and create a new one and hope it will solve the problem.  This is very frustrating for3 reasons:  (1) the issue has existed for years and Articulate does not think this issue is important.  (2)  we as users were given no chance to rename any of the built in variables.  Articulate just simply wipe out or replace our existing one which is actually being used while I have a handful of result slide generated variables just sitting in the system as those question banks + result slide have been deleted.   (3)  I don't know the background of those who developed online courses for their clients.  I am a structural engineer and professor, NOT a computer scientists.  This sort of obstacles is not helpful for us in education try to develop any online learning materials.  NO, I don't have an IT department that would do those work.  Good thing, I still have 4 weeks to assess the software.