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Each horizontal kitchen line on each floor will have grease buildup. Each should be cabled as a preventative going into the main stack, vertical. The main stack should then be cabled. If you add 20 feet plus to the cable run from each kitchen sink c/o you will have cabled the main stack...

If it's a 1 1/2 or 2 inch line, a cable is more effective against hair and hard blockages. Hydro jetters excel at grease and sludgy debris in pipes that small.

Did you cut off a trap to get a better angle into the pipe with your new cable? if so that needs to go back on to prevent sewer gas from entering the building. If the pipe and trap are intact, there may very well be a split in the cast iron pipe that is allowing sewer gas into the building...