Oracle 19c - Full export / import and cleanup

Hello All

We are in the process of migrating our 19c database. The only difference is that target database would be pluggable / PDB while the source is non multi tenant

The database size is appx 900 GB and we are planning to use FULL export / Import

We are planning to perform a few iteration of full export / import to capture the baselines and trying different settings / parallelism etc during import

On the target database server we have created a blank PDB

The question is after the first full import, what is the best way to perform a cleanup of that PDB before we can perform another iteration of the Import?