Hi,
I am not aware of the code implementation on the sites, however, I suppose the code to remove a particular slot is to call it within the googletag.destroySlots() function, e.g.:
googletag.destroySlots([slot1, slot2]);
Using the function without calling any slot would remove all slots, e.g.:
googletag.destroySlots();
I have used this document as my reference (
link). If you are facing the issue even after calling a particular slot, can you try reaching out to the Google API forum instead (
link)? They may be of more help here.
Regards,
Shaibal