How do i make my room smell better?

My brother moved out and I recently moved into my brothers room and it has a very bad, disgusting odor. The walls are very filthy and very grungy and we have carpet. Is there any tips on how to get the room to smell better? I tried to clean the walls with fabolouso and I vaccume here and there but it seems to be... show more My brother moved out and I recently moved into my brothers room and it has a very bad, disgusting odor. The walls are very filthy and very grungy and we have carpet. Is there any tips on how to get the room to smell better? I tried to clean the walls with fabolouso and I vaccume here and there but it seems to be ineffective the smell is still there and the walls are still dirty(not as dirty). What products do you reccomend that I use? I don't want to use air fresheners all of the time because the freshness would only be short lived and would be a waste of money. Please help lol, I can't live with this putrid smell any longer.
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