Back your cars out and remove any objects that are on the garage floor.

          I use a leaf blower to blow out the garage.

          Use an industrial mop and mop your floor with a gallon of water and
          about 7 oz. of vinegar.

Let air dry OR (as I do) use a squeegee and push the water out of the garage and then let dry.

Never use anything abrasive to clean the floor.  It could scratch the surface.