Short answer: you can’t guarantee a complete, server-side wipe. Deleting items or clearing search history removes what’s visible on your account, but Facebook keeps backups, logs, and copies for a period and may retain some data after an account-deletion request.
Practical, low-cost steps:
- Delete activity and search history in Facebook, unauthorize apps, remove location tags, and delete problematic posts.
- Download your data first if you want a record, then request account deletion (it can take weeks).
- Clear browser cookies/history, use private browsing for future, strip photo metadata before upload.
- Remember screenshots, messages cached by others, or third-party apps aren’t removed by your deletions.
If you want minimal, non-intrusive monitoring to keep tabs going forward, consider Spynger.