Ah - I understand. We do not have a script that just delete the object and executables, etc. It is a good idea though, and will work at it.
You are right the clean system would be used by compileTELEMAC.py to recompile the system, having deleted all objects first. But it will recompile everything.
In the meantime, I suggest you can delete the directories with your configuration name, to delete them all at once.
Will keep you in touch.
Sébastien.