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Get a chemical with sulfuric acid in it to burn all the grease or hair away. I use it all the time. It takes some time for the acid to burning away any metal unless the cast iron pipes is 100 years old. It cleans traps really , really well in baths and kitchens. I leave it for 10- no more then 15 min. It heats up the trap way while its doing it job. Flush with water for 15 min. Done. Don't poour that stuff in your garbage disposal.
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