[arch-general] [Xfce-terminal] Cannot remove entries from history

Hello, I've got the following rather suspicious problem with xfce-terminal: After removing entries from the history (using "history -d" or "history -c"), the entries are obviously buffered. When I close the terminal and the open another, the history is available again - for some reasons I do see this as a security risk. Can I remove the buffered entries somehow? Kind regards Peter