Many counters counters reporting to Perfmon where there are no associated monitorsets in the Kworking\Kmonitorsets\
Monitor sets in Kworking\Kmonitorsets\ that are very old and are not meant to be there and MD.asp is unable to remove them
Monitor counter log tables contains many records of -999 for instances that as not visible in the UI
Upload the attached agent procedure and associated executable then run against the affected machines.
This greatly differs to selfclean.txt as it performs more cleaning and it is not constrained like selfclean
Please beware that after running this script the counters will not respond for up to 1 hour. If they stay not responding this is an indication that Lua is not running and this should be resolved.