Reset/Factory reset old dietpi pi working operating system

I want to do clean installation of my working dietpi O/S host machine. is there any method to wipe everything & makes like fresh dietpi install. if i will run the debian to dietpi convert script on my working dietpi machine is it will factory reset dietpi operating system. in past i installed few software & after that un install them. so may be they having some residue. i just want to clean unnecessary components. I will reinstall my required software through new instance dietpi through dietpi-software.

The installer will not guarantee to remove each and every peace you instead over time. Best is to start with a fresh clean image in this case.

Ok, Thanks then i will concentrate on reinstalling dietpi by flashing new image. thanks