Cannot delete site columns even after removing all references

I hope it's ok to crosspost this from 2010 forums as it seems that this is also an issue in SP 2013. It's about this error when trying to delete a site column although all references have been removed from content types and lists: "Site columns which are included in content types cannot be deleted. Remove all references to this site column prior to deleting it"

Here is the "unsolved" thread from SP2010 forums:

https://social.technet.microsoft.com/Forums/office/en-US/e930964f-5c2c-4f85-bdc6-300c3a49093e/cannot-delete-site-columns-even-after-removing-all-references?forum=sharepointadminprevious&prof=required

kind regards and appreciating any help

August 27th, 2015 7:05am

Please ensure that you have removed all the list and content types referring to these columns and also cleaned up the recycle bin. Deactivating the feature or directly deleting the column should work once this is ensured.
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August 28th, 2015 2:46am

Thanks for your reply. 

What, I should delete the lists and CTs where the site columns have been used???  I have deleted all occurencies of the site columns within all lists and all content types as well as cleaned up the recycle bin. Deleting the lists and CTs itself is obviously no solution...  

August 28th, 2015 3:35am

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