It depends on the parent and the parent's mood. A parent might ask their child to do something politely (could/would you please clean your room) or be more stern/strict/direct (clean your room). The meaning is essentially the same because the penalty for not obeying the parent is going to be the same.

"Could you please sweep the floor?" in English would be a specific request to get a broom and sweep the floor with a broom. Most kids' rooms have carpeting, so usually it would be appropriate to vacuum the floor. Asking a child to sweep the floor does not mean clean the whole room. 'Clean your room" or "Clean up your room" would both be acceptable in English. Some people would also ask a child to "straighten up" their room. HOPE THAT HELPS!

I think Johnny is perfectly answered your question.