Whats the best way to clean porcieln tile floors? And granite tops.?

As far as granite counter tops they are usually covered with a treated protective seal so a sponge dipped in water and mild detergent, and gently use a plastic scrub pad to remove stubborn surface dirt. If its a spot where there is a lot of soap s or build up then you could use 1/2 cup of ammonia and 1 gallon of water. With the porceline... the ONLY thing that has worked consistent for me are the Mr. Clean MAGIC ERASERS it may sound crazy but those lil sponges work miricales with my porceline sinks, tubs, and floors. See how this helps!