anyone know how to clean a carpet that ...

has had teh same furniture on it for years and now has those annoying indentation on it wher the furniture used to sit?

My mom is fixing up my old room as a guest rooma nd boughta really nice sofa sleeper at Levitz but the rug has the outrline of my old bed ( it was a platform bed so its very defined lines on the floor) Any ideas how to get rid of this?

TIA