I ran across this problem today. Found enough bits on Stack Overflow to finally get me there, but figured I'd post a coherent answer to my question.
Problem: I can't save changes in WordFence, and need it to clear it's data on uninstall so I can reinstall it cleanly.
I found the data in the database table wp_wfConfig, but all settings are saved as
How can I change the settings so the data all clears on deleting the plugin?