Issues with Instantly Email Verification and Lead Management Tips

Hey guys, anyone use Instantly? Their verification doesn't seem to work at all, so am using Clay to verify (uploaded all leads from Instantly to a new Clay table and ran a zerobounce email verification on it). Here's my question- anyone have any good ideas on how to easily detect and delete the email addresses in Instantly? Will I need to manually do it this time around and then just get smarter about verifying leads in Clay before loading them into Instantly going forward?