[Q] lost titanium backup encryption passphrase

So I screwed up and lost the passphrase for TB encryption. I have a good working nandroid backup with all the apps+data that I would want to use for my next rom flash. The problem is when I go to TB and disable encryption on my good backup it doesnt allow me to restore the data when I flash a new rom. My question is is there a way to completely remove TB and all of it's app data so that I can start from scratch with TB in order to good unencrypted backups of my apps+data without completely formatting my sd card? Otherwise I'm stuck on my current rom setup.

Thanks!