I will share that the only exit we used was to turn off the TPM in the BIOS (varies with model so I defer to maker) then slip in a new HDD or SSD and start again.

The old drive is then put into some USB case and we try to wipe it clean with DBAN. DBAN is almost a nuclear option so be sure whatever PC you run it on has no other drives you want to be wiped out. Plenty of content about DBAN on the web so I pause here.