Heavy duty floor cleaner recipe:  ¼ cup white vinegar ,  1 tablespoon liquid dish soap ,  ¼ cup washing soda,   2 gallons tap water , very warm. Once a month. Works great.  Just cleaned my tile floors with this and it is AWESOME!  This even cleaned my grout.  I did get down on my hands and knees to scrub and let the mixture soak on the grout for about 5-10min, but the results were well worth it!!!