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Grease and everything else I bet. I don't know what this stuff is called ( really hard to find around now), but its an acid base liquid you pour down the drain. It heats up the pipes to the point where you can't touch it. It just burns off everything in there including the grease (cause of your problem more then likely) and run water water for 15 minutes to clear it up. It still might be available in Texas. I will try to look for it and get back to you.
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