Hi George, Unfortunately, the AdWordsUserList service does not support the REMOVE <https://developers.google.com/adwords/api/docs/reference/v201509/AdwordsUserListService#mutate> operator. You will have to delete the user lists from the UI. You could post your question on the advertisers community forum <https://www.en.advertisercommunity.com/t5/Google-AdWords/ct-p/Google_AdWords#> to see if the product experts there have recommendations on alternate approaches.
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