When you use a cleaner on floors, what happens to that cleaner when the water evaporates? It stays on the floors in a film.
I bought my wife a steam mop (Shark) for Christmas. Actually, my 6 year old wanted to get it because "It's the best! I watched a TV show on it!" LOL. So, we let her mop the living room floors with it for it's first use.
Our floor has never felt as clean as it did after using the steam mop. We had a 5x7 rug in the middle of the floor that was held down with double sided tape for quite a few years. We removed the rug a few years ago and there has been adhesive stuck on our floor ever since. My wife has used Murphy's Oil soap, Mr. Clean, GooGone, I even tried WD-40. The adhesive was still stuck on there. My 6 year old had all the adhesive gone with the steam mop in less than 2 minutes.