Fill almost to the top with water. Add 1 t dishwashing liquid and mix. Top off with water. Use like Windex or any other general purpose spray cleaner. From Consumer Reports.
Alcohol is the secret ingredient, and what commercial window washers use.
Combine the ingredients in a 1 gallon plastic jug, cover, and swish to mix. For small jobs, fill a pump bottle with the solution, spray directly onto the tile surface, then wipe with a damp sponge. Do not mix this cleaner with anything containing bleach. In a gallon plastic jug, combine ammonia, washing soda and 1 cup of the warm water. Cap the jug and shake briskly, then add the rest of the warm water.