The present perfect shows present results of past actions.Note that the words " just" is used to mean the immediate past.
I have cleaned my rooms.
or I have just cleaned my rooms.
It is irrelevant to whether the rooms are clean and tidy
or neat and clean.
If you want to clean the floor and furniture before spring-clean in Chinese new year, then you should say:-
eg:-I have cleaned my rooms like a cleaning woman did.