absterge

I found two options: the Facebook Timeline Cleaner and Absterge, both scripts than can run in the Firefox or Chrome browsers.

I ran Absterge over a few sections, and then over my whole timeline.

Absterge is less subtle: It deletes everything.

For example, pick “likes,” then click the Absterge button.

This happened to posts I hand-deleted as well as those deleted by Absterge.