Using Clay to Clean and Import Lead Lists for Outbound Campaigns

Hi everyone! I have two separate lead lists of around 5.000 and 7.000 leads respectively that I want to run with the custom prompts that I’ve made in clay before adding them to my outbound campaigns. I have run the 10 first rows but I wanted to hear if you can clean your lead lists within clay somehow or if it’s better to do manually and then importing the CSV files and run the prompts? I have verified all the emails on all the leads already but some of the first names, last names and other info is not clean eg. abbreviated last names. Essentially, it’s to not run 12.000 rows in clay and then after the export find out that 10% have missing information. Hope my question makes sense. Thanks!