Can I remove a value for a manual attribute?
This information relates to manually-tracked attributes. For data synced from integrated services, see How can I fix incorrect data synced from another service?
No. Once a manual attribute has a value for a particular date, it's not possible to remove the value entirely.
You can change the value by tracking a new value for that same date. For example, if you tracked 1 for "Alcoholic drinks" by mistake, you can track 0 to change the value.