I can say
Ich möchte mein Zimmer reinigen
but I can also say
Ich möchte mein Zimmer bereinigen
What is the difference?
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Sort out something that's upset you, sort out ("Settle an argument")
Remove dirt, stains or similar from something (clean something, clean up)
But you can't say "... mein Zimmer bereinigen" (as far as I know). You can clean (reinigen) your room, or clean up (aufräumen) the room.
In German duden "bereinigen" is defined as follows:
So "bereinigen" has nothing to do with cleaning or similar.